The above £5 14s. clear profit on the 20 rods, is at the rate of £45 12s. profit for one acre. Now, if a small cultivator were to plant three or four acres, and get only one-half of the above profit, it would give a good return, and would be well worth the trial.

In 1845 I planted, in the months of January and February, a quarter of an acre of good land, in arrowroot and onions.

The expense and profit stand as follow.—

This is at the rate of £90 15s. clear profit per acre, which is more than double the worth of the land. I have not named the arrowroot plants, because I have planted my land with them again, but they might be fairly put to the credit of the account. The above statement shows what may be done with good land and good management; but even if a man can only clear £10 on an acre of land, he ought not to grumble.

Dr. Ure gives a most interesting and lucid account of the mode of manufacture in the island of St. Vincent, where the plant is now cultivated with great success, and the root manufactured in a superior manner.

On the Hopewell estate, in St. Vincent, where the chief improvements have been carried out, the drying-house is constructed like the hot-house of an English garden. But instead of plants it contains about four dozen of drying pans, made of copper, 7½ feet by 4½ feet, and tinned inside. Each pan is supported on a carriage having iron axles, with lignum vitæ wheels, like those of a railway carriage, and they run on rails. Immediately after sunrise, these carriages, with their pans, covered with white gauze to exclude dust and insects, are run out into the open air, but if rain be apprehended they are run back under the glazed roof. In about four days the fecula is thoroughly dry and ready to be packed, with German silver shovels, into tins or American flour barrels, lined with paper, attached with arrowroot paste. The packages are never sent to this country in the hold of the ship, as their contents are easily tainted by noisome effluvia, of sugar, &c.

Arrowroot is often adulterated in this country with potato flour and other ingredients.

Dr. Lankester asserts that the value of arrowroot starch, as an article of diet, is not greater than that of potato starch, and that the yield of starch is not greater from the arrowroot than from potatoes; but this I must decidedly deny. Chemical analysis and experience are proofs to the contrary.

The Lancet recently stated that, on a microscopical analysis of 50 samples of arrowroot, purchased indiscriminately of various London tradesmen, 22 were found to be adulterated. In 16 cases this adulteration consisted in the addition of a single inferior product much cheaper in price, such as potato flour, sago meal, or tapioca starch, while in other instances there was a combination of these articles, potato flour being usually preponderant. Ten of the mixtures contained scarcely a particle of the genuine Maranta or West India arrowroot, for which they were sold. One consisted almost wholly of sago meal; two of potato flour and sago meal; two of potato flour, sago meal, and tapioca starch; one of tapioca starch; and four of potato arrowroot, or starch entirely. The worst specimens were those which were done up in canisters especially marked as "Genuine West India arrowroot," or as being "warranted free from adulteration;" and one, which contained a considerable quantity of potato flour, was particularly recommended to invalids, and certified as the finest quality ever imported into this country. The profits to the vendors of the inferior compounds are to be estimated from the fact that the price of sago meal and potato starch is about 4d. per lb., while the genuine Maranta arrowroot is from 1s. to 3s. 6d. per lb.

The arrowroot of Bermuda has long borne a high reputation, being manufactured on a better principle and being therefore of superior quality to that produced in Antigua, St. Vincent, and other West Indian islands. The process is tedious and requires a good deal of labor. There is no doubt, however, that the quality of the water has a great deal of influence on the fecula. Bermuda arrowroot is necessarily made from rain water collected in tanks or reservoirs, and the lime and the deposit from houses, &c., may alter its properties. After the root is taken from the ground it is placed in a mill, and is thereby cleansed of its exterior excrescences; it is then thoroughly washed, when it is ready for the large machine, the principle of which is similar to the "treadmill." A horse is placed on something like a platform, and as he prances up and down, the machinery is set in play. A person stands at the end, and places the root in the wheel of the machine, which, after being ground, falls into a trough of water. After going through this process, it is rewashed and then placed in vessels to dry in the sun. It is packed in boxes lined with blue paper or tin, and sent to the markets in England and America, where it generally meets with ready sale.

A simple method by which starch may be extracted from the fecula with much purity consists in enclosing the flour in a muslin bag and squeezing it with the fingers while submerged in clean water, by which process the starch passes out in a state of white powder and subsides. Two essential constituents of flour are thus separated from each other; a viscid substance remains in the bag, which is called gluten, and the white powder deposited is starch.

The principal quarters from whence the supply is derived, are the Bermudas, St. Vincent, Barbados and Grenada, in the West Indies; Ceylon, and some other parts of the East—and a few of our settlements on the West coast of Africa. The annual imports for home consumption average 500 tons.

The cultivation of arrowroot for the production of starch in St. Vincent has increased enormously of late years. In 1835, the island produced 41,397 lbs.; in 1845 it exported 828,842 lbs. The exports to 15th June, 1851, were, 2,934 barrels, 2,083 half barrels, 5,610 tins. The culture is year by year extending, and as, unlike that of the sugar cane, it may be carried on on a small scale with very little outlay of capital, we may reasonably anticipate a still further progressive extension for some years to come. Arrowroot, when once established in virgin soil, produces several crops with very little culture. In the first half of 1851, 25,027 lbs. were shipped from Montego Bay, Jamaica. The quantity of arrowroot on which duty of 1s. per cwt. was paid in the six years ending 1840, was as follows:—

The imports in the last few years have been in

About 500 cwt. are re-exported.

East India arrowroot is procured in part from Curcuma angustifolia, known locally as Tikoor in the East, and a similar kind of starch is yielded by C. Zerumbet, C. rubescens, C. leucorhiza, and Alpinia Galanga, the Galangale root of commerce. C. angustifolia grows abundantly on the Malabar coast, and is cultivated about the districts of Patna, Sagur and the south-west frontier, Mysore, Vizigapatam, and Canjam, Cochin and Tellicherry. It was discovered but a few years ago growing wild in the forests extending from the banks of the Sona to Nugpore.

The particles of East India arrowroot are very unequal in size, but on the average are larger than those of West India arrowroot.

Chinese arrowroot is said to be made from the root of Nelumbium speciosum.

The original Indian arrowroot is extracted at Travancore, according to Ainslie, from the root of the Curcuma angustifolia. It is easily distinguished by its form, which is sometimes ovoid, sometimes elongated, of considerable size, rounded at one of the extremities, and terminating in a point at the other, often resembling a grain of rice.

The manufacture of arrowroot on the southern borders of the Everglades, at Key West, Florida, bids fair to become as extensive and as profitable as at Bermuda, whence, at present, we receive the bulk of our supplies. The wild root, which the Indians call Compti, grows spontaneously over an immense area of otherwise barren land. It is easily gathered, and is first peeled in large hoppers ingeniously contrived, and thrown into a cylinder and ground into an impalpable pulp. It is then washed and dried in the sun, baked and broken into small lumps, when it is ready for the market. The article is extensively used in the Eastern woollen and cotton establishments, as well as for family use. Arrowroot is cultivated in the interior of East Florida with great success. It is also cultivated to a considerable extent in Georgia, and is, I understand, a profitable crop.

The following is the process of manufacture:—The roots, when a year old, are dug up, and beaten in deep wooden mortars to a pulp; which is then put into a tub of clean water, well washed, and the fibrous part thrown away. The milky liquor being passed through a sieve or coarse cloth, is suffered to settle, and the clean water is drawn off; at the bottom of the vessel is a white mass, which is again mixed with clean water, and drained; lastly the mass is dried in the sun, and is pure starch. Arrowroot can be kept without spoiling for a very long time.

A considerable quantity of arrowroot is now produced in the Sandwich Islands. In 1841 arrowroot to the value of 3,320 dolls. was shipped, and in 1843, 35,140 lbs., valued at £1,405, was exported, principally to Tepic and San Blas, where it is used as starch for linen.

A kind of arrowroot of very good quality was sent to the Great Exhibition of 1851, by Sir R. Schomburgk, which is obtained in St. Domingo from the stems of a species of Zamia, called there Guanjiga; and the Zamia Australis, of Western Australia, yields even better fecula. The taste was unpleasant and salt, as if it had been immersed in lime. The other starch, from the Western Australian Zamia, in quality rivalled arrowroot. This fecula hangs together in chains, quite unlike the ordinary appearance of arrowroot when seen under the microscope.

In the spring of 1851, 201,130 lbs. were shipped from Bermuda.

In 1843 the quantity of arrowroot in the rough state made in Bermuda was 1,110,500 lbs.

Barbados exported in 1832, 16,814 lbs., value £469; in 1840, 387 packages; in 1843, 302; in 1844, 790 packages; in 1851, 306 packages; these average about 30 lbs. each.

Ceylon now produces excellent arrowroot. In 1842, 150 boxes were exported; in 1843, 200; in 1844, 300; in 1845, 600 boxes.

From Africa we now import a large quantity: 250 boxes were received in 1846. Not unfrequently arrowroot from Africa has been sent to the West Indies in the ships with the liberated Africans, and thence re-exported to England, as of St. Vincent or Bermuda growth. The duty on arrowroot, under the new tariff, is equalised on all kinds to 4½d. per lb.

The imports and home consumption of arrowroot have increased very largely, as may be seen from the following figures:—

SALEP is the prepared and dried roots of several orchideous plants, and is sometimes sold in the state of powder. Indigenous salep is procured, according to Dr. Perceval from Orchis mascula, O. latifolia, O. morio, and other native plants of this order. On the continent it is obtained from O. papilionaceo, and militaris. Oriental salep is procured from other orchideœ. Professor Royle states that the salep of Kashmir is obtained from a species of Eulophia, probably E. virens. Salep is also obtained from the tuberous roots of Tacca pinnatifida, and other species of the same genus, which are principally natives of the East Indies and the South Sea Islands.

The large fleshy tubers of tacca, when scraped and frequently washed, yield a nutritious fecula resembling arrowroot.

Salep consists chiefly of bassorin, some soluble gum, and a little starch. It forms an article of diet fitted for convalescents when boiled with water or milk. The price of salep is about eight guineas per cwt. in the London market. A little is exported from Constantinople, as I noticed a shipment of 66 casks in 1842; excellent specimens from this quarter were shown in the Egyptian department of the Great Exhibition in 1851. It was formerly a great deal used, but has latterly been much superseded by other articles.

Major D. Williams ("Journal of the Agri. and Hort. Soc. of India," vol. iv., part I), states that the tacca plant abounds in certain parts of the province of Arracan, where the Mugs prepare the farina for export to the China market.

After removing the peel, the root is grated on a fish-skin, and the pulp having been strained through a coarse cloth, is washed three or four times in water, and then dried in the sun.

According to a recent examination of the plant by Mr. Nuttall ("American Journal of Pharmacy," vol. ix., p. 305), the Otaheite salep is obtained from a new species of tacca, which he names T. oceanica.

The tacca plant grows at Zanzibar, and is found naturalised on the high islands of the Pacific. The art of preparing arrowroot from it is aboriginal with the Polynesians and Feejeeans.

At Tahiti the fecula is procured by washing the tubers, scraping off their outer skin, and then reducing them to a pulp by friction, on a kind of rasp, made by winding coarse twine (formed of the coco-nut fibre) regularly round a board. The pulp is washed with sea water through a sieve, made of the fibrous web which protects the young frond of the coco-nut palm. The strained liquor is received in a wooden trough, in which the fecula is deposited; and the supernatant liquor being poured off, the sediment is formed into balls, which are dried in the sun for twelve or twenty-four hours, then broken and reduced to powder, which is spread out in the sun further to dry. In some parts of the world cakes of a large size are made of the meal, which form an article of diet in China, Cochin-Caina, Travancore, &c., where they are eaten by the natives with some acid to subdue their acrimony.

Some twenty varieties of the Ti plant (Diacaena terminalis) are cultivated in the Polynesian islands. There is, however, but one which is considered farinaceous and edible. In Java the root is considered a valuable medicine in dysentery.

Within the last three or four years, considerable quantities of a feculent substance, called Tous les mois, have been imported from the West Indies. It is cultivated in Barbados, St. Kitts, and the French islands, and is said to be prepared by a tedious and troublesome process from the rhizomes of various species of Canna Coccinea, Achiras, glauca, and edulis. It approaches more nearly to potato starch than to any other fecula, but its particles are larger. Like the other amylaceous substances, it forms a valuable and nutritious article of food for the invalid.

The large tuberous roots of the Canna are equal in size to the human head. The plant attains in rich soils a stature of fourteen feet, and is identical, it is supposed, with the Achira of Choco, which has an esculent root highly esteemed; and my friend, Dr. Hamilton, of Plymouth, has named it provisionally, in consequence, Canna achira. The starch of this root, he asserts, is superior to that of the Maranta.

ROOT CROPS.

The comparative amount of human food that can be produced upon an acre from different crops, is worthy of great consideration. One hundred bushels of Indian corn per acre is not an uncommon crop. One peck per week will not only sustain life, but give a man strength to labor, if the stomach is properly toned to the amount of food. This, then, would feed one man 400 weeks, or almost eight years! 400 bushels of potatoes can also be raised upon an acre. This would give a bushel a week for the same length of time; and the actual weight of an acre of sweet potatoes (Convolvulus batatas) is 21,344 lbs., which is not considered an extraordinary crop. This would feed a man (six pounds a day) for 3,557 days, or nine and two-third years!

To vary the diet we will occasionally give rice, which has been grown at the rate of 93 bushels to the acre, over an entire field. This, at 45 lbs. to the bushel, would be 4,185 lbs.; or, at 28 lbs. to the bushel when husked, 2,604 lbs., which, at two pounds a day, would feed a man 1,302 days, or more than three-and-a-half years!

POTATOES.

The common English or Irish potato (Solanum tuberosum), so extensively cultivated throughout most of the temperate countries of the civilised globe, contributing as it does to the necessities of a large portion of the human race, as well as to the nourishment and fattening of stock, is regarded as of but little less importance in our national economy than wheat or other grain. It has been found in an indigenous state in Chili, on the mountains near Valparaiso and Mendoza; also near Monte Video, Lima, Quito, as well as in Santa Fe de Bogota, and more recently in Mexico, on the flanks of Orizaba.

Notwithstanding its utility as a food became better known, no high character was attached to it; and the writers on gardening towards the end of the seventeenth century, a hundred years or more after its introduction, treated of it rather indifferently. "They are much used in Ireland and America as bread," says one author, "and may be propagated with advantage to poor people."

The famous nurserymen, Loudon and Wise, did not consider it worthy of notice in their "Complete Gardener," published in 1719. But its use gradually spread as its excellencies became better understood. It was near the middle of the last century before it was generally known either in Britain or North America, since which it has been most extensively cultivated.

The period of the introduction of the common potato into the British North American colonies, is not precisely known. It is mentioned among the products of Carolina and Virginia in 1749, and by Kalm as growing in New York the same year.

The chief varieties cultivated in the Northern States of America are the carter, the kidneys, the pink-eyes, the mercer, the orange, the Sault Ste. Marie, the merino, and Western red; in the Middle and Western States, the mercer, the long red, or merino, the orange, and the Western red. The yield varies from 50 to 400 bushels and upwards per acre, but generally it is below 200 bushels.

Within the last ten years an alarming disease, or "rot," has attacked the tubers of this plant, about the time they are fully grown. It has not only appeared in nearly every part of America, but has spread dismay, at times, throughout Great Britain and Ireland, and has been felt more or less seriously in every quarter of the globe.

To the greater uncertainty attending its cultivation of late years, must be attributed the deficiency of the United States crop of 1849, as compared with that of 1839. This is one of the four agricultural products which, by the last census, appears smaller than ten years since.—("American Census Reports for 1850.")

The crops in Ireland, where the potato is the principal object of culture, vary from 1½ to 10½ tons per acre, according to the season; but in the average of three years ending 1849, the annual growth of Great Britain and Ireland amounted to nine million tons, which, at £3 per ton, exhibits the value at £27,000,000 sterling. Ireland produced in 1847 a little over two million tons, the yield being 7¼ tons per acre. In 1848 the produce was 2,880,814 tons, averaging only four tons to the acre. In 1849, 4,014,122 tons, averaging 5½ tons to the acre. In 1850, 3,954,990 tons; and in 1851, 4,441,022 tons; the average yield per acre not stated. In many parts of Scotland 24 tons to the acre are raised. The sales of potatoes in the principal metropolitan markets exceed 140,000 tons a year, which are irrespective of the sales which take place at railway stations, wharfs, shops, &c. The imports into the United Kingdom average about 70,000 tons annually. Potatoes are exported to the West Indies, Mediterranean, and other quarters. For emigrant ships, preserved or dried potato flour is now much used.

The following quantities of potato flour were imported from France in the last few years:—

The second fact is this:—Mr. Wasileffsky, a gentlemen residing in the government of Mohileff, is in the habit of keeping potatoes all the year round, by storing them in the place where his hams are smoked. It happened that in the spring of 1852 his seed potatoes, kept in the usual manner, were insufficient, and he made up the requisite quantity with some of those which had been for a month in the smoking place. These potatoes produced a capital crop, very little diseased, while at the same time the crop from the sets which were not smoke-dried was extensively attacked by disease. Professor Bollman is of opinion that there would have been no disease at all if the sets had been better dried.

The temperature required to produce the desired result is not very clearly made out. Mr. Bollman's room, in which his first potatoes were dried, was heated to about 72 degrees, and much higher. By way of experiment he placed others in the chamber of the stove itself, where the thermometer stood at 136 degrees, and more. He also ascertained that the vitality of the potato is not affected, even if the rind is charred. Those who have the use of a malt-kiln, or even a lime-kiln, might try the effect of excessive drying, for a month seems to be long enough for the process.—(Gardener's Chronicle.)

The potato crop of the United States exceeds 100 million bushels, nearly all of which are consumed in the country; the average exports of the last eight years not having exceeded 160,000 bushels per annum.

According to the census returns of 1840, the quantity of potatoes of all sorts raised in the Union, was 108,298,060 bushels; of 1850, 104,055,989 bushels, of which 38,259,196 bushels were sweet potatoes.

Last year (1852) there was under cultivation with potatoes in Canada, the following extent of land:—

About 782,008 cwts. of potatoes are annually exported from the Canary Islands. In Prussia, 153 million hectolitres of potatoes were raised in 1849. In 1840 Van Diemen's Land produced 15,000 tons of potatoes, on about 5,000 acres of land.

The potato is not yet an article of so much importance in France, as in England or the Low Countries, but within the last twenty years its cultivation has increased very rapidly. It is mostly grown where corn is the least cultivated. The quantity raised in 1818, was 29,231,867 hectolitres, which had increased in 1835 to 71,982,814 hectolitres. About 2,000,000 hectolitres of chesnuts are also annually consumed in France, a portion of the rural population in some of the Central and Southern Departments living almost entirely on them for half the year.

In Peru dried potatoes are thus prepared:—Small potatoes are boiled, peeled, and then dried in the sun, but the best are those dried by the severe frosts on the mountains. In the Cordilleras they are covered with ice, until they assume a horny appearance. Powdered, it is called chimo. They will keep for any length of time, and when used required to be bruised and soaked. If introduced as a vegetable substance in long sea voyages, the potato thus dried would be found wholesome and nourishing. A large and profitable business is now carried on, in what is called "preserved potatoes," for ships' use, prepared by Messrs. Edwards and Co., which are found exceedingly useful in the Royal Navy, in emigrant ships, for troops and other services, from their portability, nutritious properties, and being uninjured by climate.

The first six varieties were analysed by Einhoff, the next four by Lamped, and the last named by Henry.

YAMS.

As an edible root the buck yam, especially when grown in a light soil, is equal to the potato, if not superior to it. It does not, however, keep for any length of time, and therefore could not be exported to Europe, unless the roots were sliced and dried.

Yams and sweet potatoes thrive well in the northern parts of Australia; indeed the former are indigenous there, and constitute the chief article of vegetable food used by the natives. The yam was introduced into Sweden, where it succeeded well, and bread, starch, and brandy were made from it, but it prefers a warmer climate.

Yams are occasionally brought to this country. When cooked, either by roasting or boiling, the root is even more nutritious than the potato, nor is it possessed of any unpalatable flavor, the pecularity being between that of rice and the potato. Dressed in milk, or mashed, they are absolutely a delicacy; and from the abundance in which they are cultivated in the West Indies and other parts, they promise to become a most economical and nutritious substitute for the potato.

The yam frequently grows to the enormous size of forty or fifty pounds weight, but in this large state it is coarse-flavored and fibrous.

An acre of land is capable of producing 4½ tons of yams, and the same quantity of sweet potatoes, within the twelve months, or nine tons per acre for both, being nearly as much as the return obtained at home in the cultivation of potatoes; and I have the authority of all analytical chemists for saying that in point of value, as an article of food, the superiority is as two to one in favor of the tropical roots.

The kidney-rooted yam (D. pentaphylla), is indigenous to the Polynesian islands, and is sometimes cultivated for its roots. It is called kawaii in the Feejee islands. D. bulbifera, a native of the East, is also abundantly naturalised in the Polynesian islands, but is not considered edible.

COCOS OR EDDOES

Arum esculentum.—This root has not hitherto been considered of sufficient importance to demand particular care in its cultivation, except by those who are engaged in agricultural pursuits, and derive their subsistence from the production of the soil. But though the cultivation of the root is almost unknown to the higher classes in society, and little regarded by planters in the colonies, it is a most valuable article of consumption. Amongst the laboring population it is the principal dependence for a supply of food. Long droughts may disappoint the hopes of the yam crop, storms and blight may destroy the plantain walks, but neither dry or wet weather materially injure the coco; it will always make some return, and though it may not afford a plentiful crop, it will yield a sufficiency until a supply can be had from other sources. For this reason the laborer in the West Indies always takes care to put in a good plant of cocos to his provision ground as a stand by, and knowing their value, is perhaps the only person who bestows any degree of care or attention upon them. Previous to their emancipation, whole families of negroes lived upon the produce of one provision ground, and the coco formed the main article of their support. Where the soil is congenial to the white and black Bourbon coco, the labor of one industrious person once a fortnight will raise a supply sufficient for the consumption of a family of six or seven persons. The coco begins to bear after the first year, and with common care and cultivation the same plant ought to give annually two or three returns for several years. In Jamaica, a disease something similar to that affecting the potato, has been found injurious to the coco root. This disease, which has baffled all inquiry as to its origin, affects the plants in and after the second year of their being planted. The first indication of it is the change in the leaves, which gradually turn to a yellow hue, have a sickly appearance, and at length drop off at the surface of the earth. The stock or "coco head," as it is called, below ground, having become rotten, nothing but a soft pulpy mass remains. In some fields every third or fourth root is thus affected, in others much greater numbers are destroyed, so much so that the field requires to be almost entirely replanted, by which not only an expense is entailed, but a heavy loss sustained, from the field being thrown out of its regular bearing. The black coco seems to suffer less than the white.

SWEET POTATOES.

The batatas, or camote of the Spanish colonies (Convolvulus batatas, Linn; Batatas edulis, of Choisy, and the Ipomæa Batatas of other botanists), belongs to a family of plants which has been split into several genera. It is a native of the East Indies, and of intertropical America, and was the "potato" of the old English writers in the early part of the fourteenth century. It was doubtless introduced into Carolina, Georgia, and Virginia soon after their settlement by the Europeans, being mentioned as one of the cultivated products of those colonies as early as the year 1648. It grows in excessive abundance throughout the Southern States of America, and as far north as New Jersey, and the southern part of Michigan. The varieties cultivated there are the purple, the red, the yellow, and the white, the former of which is confined to the South.

The amount of sweet potatoes exported from South Carolina in 1747-48, was 700 bushels; that of the common potato exported from the United States, 1820-21, 90,889,000 bushels; in 1830-31, 112,875,000 bushels; in 1840-41, 136,095,000 bushels; in 1850-51, 106,342,000 bushels.

The sweet potato is cultivated generally in all the intertropical regions, for the sake of its roots, and as a legume in temperate countries. In the Southern States of North America, the culture ceases in Carolina under latitude 36 degs.; in Portugal and Spain it reaches to latitude 40 and 42 deg.; and as a legume its cultivation is attempted to the vicinity of Paris. In India it is a very common crop; its tubers are very similar to the potato, but have a sweeter taste, whence the common name; but it must not be confounded with the topinambur (Helianthus tuberosus), a native of Brazil, which is less cultivated. The root contains much saccharine and amylaceous matter.

Several marked varieties of the sweet potato are raised in the Polynesian groups. In some islands it forms the principal object of cultivation.

A valuable addition has lately been made to the votaries of the sweet potato in Alabama, supposed to be from Peru. A letter describing it says:—"It is altogether different and equally superior to any variety of this root hitherto known. It is productive, and attains a prodigious size, even upon the poorest sandy land, and the roots remain without change from the time of taking them out of the ground until the following May. The plant is singularly easy of cultivation, growing equally well from the slip or vine, the top or vine of the full-grown plant being remarkably small; the inside is as white as snow. It is dry and mealy, and the saccharine principle contained resembles in delicacy of flavor fine virgin honey."

There is in general a great error in cultivating this root, as most people still plant in the old way, two or three sets in the hole, which is a great deal too close.

When a piece of land is to be planted in sweet potatoes, it should be top-dressed with some manure, to be dug or ploughed under a week or two before it is to be planted. Drills should be made two feet apart, and the potatoes placed in the drill about one foot asunder. From eight to twelve to the pound are the best size for planting. The "white upright" kind, when intended for sets, should be taken up early in March, and kept about a month, so as to be quite dry before planting. Abundant crops can rarely be raised from the stem of the "uprights;" the old potato, however, grows to a large size. I have planted a potato weighing about an ounce, and dug it up in August, weighing over two pounds. The drills can be made with a small plough to great advantage, when a person understands it.

The best manure for the sweet potato is anything green, such as fresh seaweed, green oats, bushes, or anything of the kind, put in in abundance.

Care should be taken to get early and good strong slips. A slip with about six joints is quite long enough; three or four joints to be put under ground, and the rest above. For slips, the land must be prepared as already described for the potatoes; this should be done before the slips are ready to cut.

The best way to plant slips is to drill, the same way as for the potatoes, only a little closer; then put the end of the slip in, leaving about two joints out of ground, placing them one foot apart. The drills can be made in dry weather, so as not to have any delay when it rains; by this means a great many can be planted in a day.

The sweet potato of Java, says Mr. Crawfurd, is the finest I ever met with. Some are frequently of several pounds weight, and now and then have been found of the enormous weight of 50 lbs. The sweetness is not disagreeable to the palate, though considerable, and they contain a large portion of farinaceous matter, being as mealy as the best of our own potatoes. In Java it is cultivated in ordinary upland arable, or in the dry season as a green crop in succession to rice.

A tuberous root (Ocymum tuberosum), an inhabitant of the hot plains, is frequently cultivated in Java. It is small, round, and much resembling in appearance the American potato, but has no great flavor. Its local name is kantang.

CASSAVA OR MANIOC.

Of this plant, which is a shrub about six feet high, extensively grown for its farinaceous root, there are several species, nearly all natives of America, principally of Brazil, whence it derives one of its common names of Manihot or Mandioc. Two species of Manihot have been found indigenous in South Australia. The varieties commonly cultivated for their roots, are the sweet and the bitter.

1. Sweet cassava (Janiphi (or Jatropha,) Loeflingii, Kunth; Manihot Aipi, of Pohl).—This species has a spindle-shaped root brown externally, about six or seven ounces or more in weight, which contains amylaceous matter, without any bitterness, and is used as food, after being rasped and washed, so as to cleanse it from the fibrous matter, in the same manner as arrowroot is prepared. It is distinguished from the bitter cassava by a tough ligneous fibre, which runs through the heart of the tuber. Manihot starch is sometimes imported into Europe under the name of Brazilian arrowroot. The cassava is known in Peru as yucca.

A dry mixed soil is best suited to its culture. So exhausting is this crop, that it cannot be raised more than two or three times successively on the same land. The roots arrive at maturity in eight or nine months after planting, but may be kept in the ground a much longer time without injury. Sweet cassava might be sliced, dried in the sun, and sent to Europe in that state. In dry weather the process succeeds remarkably well, and the dried slices keep for a considerable time. Dr. Shier ascertained that when these sliced and dried roots were first steeped and then boiled, they return to very nearly their original condition, and make an excellent substitute for the potato.

The starch of the root of the manioc is prepared in the following manner, as described by Dr. Ure:—" The roots are washed and reduced to a pulp by means of a rasp or grater. The pulp is put into coarse strong canvas bags, and thus submitted to the action of a powerful press, by which it parts with most of its noxious juice. As the active principle of this juice is volatile, it is easily dissipated by baking the squeezed cakes of pulp upon a plate of hot iron. The pulp thus dried concretes into lumps, which become hard and friable as they cool. They are then broken into pieces, and laid out in the sun to dry. In this state they are a wholesome nutriment. These cakes constitute the only provisions laid in by the natives, in their voyages upon the Amazon. Boiled in water, with a little beef or mutton, they form a kind of soup similar to that of rice.

The cassava cakes sent to Europe are composed almost entirely of starch, along with a few fibres of the ligneous matter. It may be purified by diffusion in warm water, passing the milky mixture through a linen cloth, evaporating the straining liquid over the fire, with constant agitation. The starch, dissolved by the heat, thickens as the water evaporates, but on being stirred it becomes granulated, and must be finally dried in a proper stove.

2. Bitter cassava (Janipha Manihot, of Kunth; Jatropha Manihot, of Linnæus; and Manihot utilissima, Pohl).—This species has a knotty root, black externally, which is occasionally 30 lbs. in weight. In the root there is much starchy matter deposited, usually along with a poisonous narcotic substance, which is said to be hydrocyanic acid. The juice of the plant, when distilled, affords as a first product a liquor which, in the dose of thirty drops, will cause the death of a man in six minutes. It is doubted whether this acid pre-exists in the plant; some suppose it to be generated after it is grated down into a pulp. It can be driven off by roasting, and then the starch is used in the form of cassava bread. It is principally from the starch of the bitter cassava that tapioca is prepared by elutriation and granulating on hot plates. This serves to agglutinate it into the form of concretions, constituting the tapioca of commerce. This being starch very nearly pure, is often prescribed by physicians as an aliment of easy digestion. A tolerably good imitation of it is made by beating, stirring, and drying potato starch in a similar way.