Didel´phis. A genus of marsupial mammals.

Didel´phidæ. A tribe of marsupial mammals.

Digita´ta. Lat. Digitate; spread out like the fingers.

Dino´rnis. From the Gr. deinos, great, terrible, and ornis, a bird. A genus of fossil, or extinct birds.

Dio´tis. From the Gr. diôtos, having two ears: referring to the flower. A genus of plants of the family of heliantháceæ.

Dislocation. Displacement. In geology where strata or veins have been displaced from the position where first deposited or formed, they are said to be dislocated.

Di´sa. A genus of plants of the family of Orchi´deæ. Di´sa grandiflora. Large-flowered Disa.

Dio´sma. From the Gr. dios, divine, and osme, smell. A genus of plants of the family of Dios´meæ.

Dillenia´ceæ. Proper name. A family of plants.

Dionæ´a. One of the names of Venus. A genus of plants of the family of Droserácea. Dionæa musci´pula. Venus’ Fly-trap.

Dip´teryx. From the Gr. dis, double, and pterux, a wing, in allusion to the two appendages of the calyx. Tonquin Bean. A genus of plants of the family of Leguminósæ. Dip´teryx odora´ta. Sweet-scented Tonquin Bean.

Dic´tyota. From the Gr. dictuon, a net. A genus of plants of the family of Phy´ceæ, and tribe of dictyóteæ.

Dictyo´nema. From the Gr. dictuon, a net, and nema, a filament. A genus of plants of the family of Phy´ceæ.

Dip. In geology direction of the inclination of strata. “To take a dip,” is to measure the degree that a stratum inclines or dips from a horizontal line.

Dis´integrate. From the Lat. de, privative, and integer, a whole. To separate or break up an aggregate into parts.

Do´lomite. Magnesian marble, or granular magnesian carbonate of lime. Named after Dolomieu.

Dombe´ya. In honor of Joseph Dombey. A genus of plants of the family of Byttneriácea: it is found in Madagascar and the Isle of Bourbon.

Dorsige´ra. Lat. From dorsum, the back, a ridge, and gero, I carry or wear. A specific name.

Dorya´nthes. From the Gr. doru, doratos, a lance, and anthesis, a flowering. A genus of plants of the family of Amaryllidáceæ.

Draba. A genus of plants of the family of Cruciferæ.

Dracæna. Lat. A genus of Saurians.

Dracænæ. Plural of Dracæna.

Dryoba´lanops. From the Gr. drus, os, an oak, balanos, an acorn, and ops, aspect. A genus of plants of the family of Dip´terocárpeæ. Dryobalanos camphora. The camphor tree of Sumatra.

Dyna´mic. From the Gr. dunamis, power, force. Belonging or relating to dynamics.

Dynamics. The doctrine of forces as exhibited in moving bodies which are at liberty to obey the impulses communicated to them. The motions of celestial bodies in their orbits, or of a stone falling freely through the air, are embraced in the study of dynamics.

Di´dymium. A metal discovered recently by Mosander.

Earths. Formerly chemists, believing them to be simple bodies, included the following substances under the name of earths: Baryta, Strontia, Lime, Magnesia, Alumina or clay, Silica, Glucina, Zirconia, and Yttria. Research has shown that all have metallic or metalloid bases.

Echid´na. Greek name of a monster, supposed to have the body of a beautiful woman, and the tail of a serpent. A genus of mammals of the family of Monotrema.

E´chimys. From the Gr. echinos, spiny, and mus, a rat. A genus of mammals; a sort of rat found in South America.

Ecliptic. In Astronomy the great circle of the heavens which the sun appears to describe in his annual revolution.

Edenta´ta. From the Lat. e, without, and dens, tooth: without teeth. An order of mammals which are destitute of teeth.

E´dulis. Lat. Eatable; that which may be eaten.

Efflore´scence. The pulverulent covering formed on the surface of saline substances from which the atmosphere has removed the water of crystallization. When saline substances give up their water of crystalization to the air, they are said to effloresce.

Elaps. Gr. Name of a serpent. A genus of ophidians.

Electricity. From the Gr. elektron, amber, the substance in which it was first observed. The property acquired by glass and resin from friction to attract light substances. Electricity exists in all bodies, and becomes manifest, at least partially, whenever the natural state of equilibrium of their molecules is disturbed by any cause.

Electro-magnetism. The phenomena produced when a current of electricity is traversing any substance, or when electricity is in motion, magnetism is at the same time developed.

Electro-magnet. An apparatus for exhibiting the phenomena of electro-magnetism.

Elec´tricus. Lat. Electric. Belonging to, or relating to electricity.

Ellip´tica. Lat. Elliptic.

E´lephas. Lat. Gr. name of the elephant. A genus of mammals of the order of pachydemus.

Elephanti´na. Lat. Belonging or relating to an elephant; elephantine.

Em´bryo. From the Gr. embruon, from, bruô I bud forth. A germ at the early stages of development.

E´merald. A mineral of a beautiful green colour, much valued for ornamental jewelry. It consists of silica, alumina, glucina, oxide of chromium, which is the colouring matter, and a trace of lime.

E´mys. Lat. From the Gr. emus, a water tortoise. A genus of reptiles of the family of emydians.

Emy´dians. A family of reptiles of the order of Chelónia.

Encri´nites. From the Gr. krinon, a lily. A genus of fossil Echinoderms. The skeleton of this animal is said to consist of not less than 26,000 separate pieces.

E´oce´ne. From the Gr. eôs, dawn, and kainos, recent. In geology a name for the older tertiary formation, in which the first dawn, as it were, of existing species, appear.

Epacri´deæ. From the Gr. epi, upon, and akros, an elevated place, a hill. A family of plants.

Ep´iphyte. From the Gr. epi, upon, and phutos, a plant. Applied to plants which grow upon other plants.

Equinoctia´lis. Lat. Equinoctial.

Equise´tum. From the Lat equus, a horse, and seta, hair. A genus of plants of the family of equisitáceæ.

Equus. Lat. A horse. A genus of mammals.

Er´bium. A metal, recently discovered.

Erica. A genus of plants of which there are 429 species.

Eri´ocaulon. From the Gr. erion, wool, and kaulon, stem or stalk. A genus of plants of the family of eriocaulóneæ.

Erythri´na. From the Gr. eruthros, red. A genus of plants of the family of Papilionáceæ.

Erythrox´ylon. From the Gr. eruthros, red, and xulon, wood. A genus of plants.

Escarpment. From the Ital. scarpa, sharp, formed from the Lat. carpere, to cut. The steep face often presented by the abrupt termination of strata where subjacent beds crop out from beneath them.

Esculenta. Lat. Esculent.

Eucaly´pti. Lat. Plural of eucalyptus.

Eucaly´ptus. From the Gr. eu, well, and kaluptos, covered. A genus of plants of the family of Myrtáceæ.

Eupho´rbia. Gr. Name of a plant. A genus of plants of which there are 300 species.

Exce´lsa. Lat. Noble, tall, stately.

Exco´rtica. Lat. Without bark.

Ex´ogenous. From the Gr. ex, from, and geinomai, I grow. Applied to plants which grow by successive external additions to their wood.

Extensile. Having the power to extend itself.

Exu´viæ. Lat. The sloughs or cast skins, or cast shells of animals.

Fa´gus. Lat. Beech. A genus of plants of the family of Amentáceæ.

Falco. Lat. Falcon. A genus of birds. Falco islandicus. The Gerfalcon.

Family. In natural history the term is applied to an assemblage of several genera which resemble each other in many respects.

Far´ina. Lat. Meal.

Far´inha. Portu. Meal, flour.

Farino´sa. Lat. Meally; belonging or relating to meal.

Fauna. All animals of all kinds peculiar to a country constitute the fauna of that country.

Felis. Lat, A cat. A genus of mammals of the family of carnivóra. Felis irbis. The panther.

Fenestra´lis. Lat. Belonging or relating to a window or opening.

Fer´bium. A recently discovered metal.

Ferns. The filices; an order of cryptogámic plants.

Fi´cus. Lat. A fig. A genus of plants of the family of Moræ´ceæ.

Ficoide. A genus of plants of the family of Mesembrya´nthe´meæ, of which there are about 200 species.

Flacour´tia. Proper name. A genus of plants of the family of Flacourtiáceæ.

Flabel´liforme. From the Lat. flabellum, a fan, and forma, form. Fan-shaped.

Flora. Lat. Name of the Goddess of Flowers. All the plants of all kinds belonging to a country constitute the flora of that country.

Flo´rida. Belonging or relating to flowers; or relating to the State of Florida.

Foci. Lat. Plural of focus.

Focus. Lat. A hearth. In optics the term describes the point or space where the rays of light are concentrated by a lens. The apex of a cone of rays of light, or of heat, formed by a lens, or concave mirror.

Folia´ceous. From the Lat. folium, a leaf. Leafy. Having the form of leaves.

Footstalks. In botany the stalks of flowers, or of leaves.

Fossil. From the Lat. fodio, I dig. Any organic body, or the traces of any organic body, whether animal or vegetable, which has been buried in the earth by natural causes.

Fossili´ferous. Contain fossils.

Formi´cidæ. From the Lat. formica, an ant, and the Gr. eidos, resemblance. A family of insects of the family of Hymenóptera.

Frond. Also, frons. A name applied to the leaves of palms, and of cryptógamous plants.

Frondo´sa. Lat. Full of green leaves.

Fra´grans. Lat. Fragrant; odorous.

Fra´gilis. Lat. Fragile; easily broken.

Fringi´llæ. Lat. fringilla, a chafinch. A family of birds, the most numerous of the group of conirostres, or thick billed birds.

Fucca. Name of a genus of aquatic plants.

Fuci. Lat. Plural of fucus.

Fucus. Lat. Sea-weed. A genus of aquatic plants.

Fuchsia. After Leonard Fuchs, a physician of the 16th century. A genus of plants.

Function. From the Lat. fungor, I act. The action of an organ, or system of organs.

Fungi. Lat. Plural of fungus.

Fungus. Lat. A mushroom.

Fune´reus. Lat. Funeral: belonging to a dead body.

Ga´dus. Lat. A codfish.

Gallina´ceous. From the Lat. galle´na, a hen. Relating to birds of the order of Gallináceæ.

Gale´na. From the Gr. galene, lead ore. A mineral composed of sulphur and lead: a natural sulphuret of lead.

Gal´vanism. From Galvani, a distinguished Italian philosopher. That branch of electrical science in which electricity is made manifest by the mediate contact of different metals. Also, the phenomena exhibited by living animal matter when placed between the poles or extremities of an apparatus for showing electricity by the mediate contact of different metals.

Galva´nic. Belonging or relating to galvanism.

Gangea´ticus. Lat. Gangeatic; belonging or relating to the river Ganges.

Garde´nia. After a proper name. A genus of plants of the family of Rubiáceæ; it contains some forty species. The Gardenia grandiflora is the Cape Jasmin.

Gar´net. A mineral consisting of silicates of alumina, lime, iron, and manganese. It occurs imbedded in mica-slate, granite, and gneiss, and occasionally in limestone, chlorite-slate, serpentine, and lava. There are several varieties of garnet.

Gas. From the Germ. geist, spirit. The name given to all permanently elastic fluids, or airs, different from the atmospheric air.

Gaseous. Of the nature of gas.

Genre. Fr. Genus, kind, manner, style. In painting it is applied to signify the representation of certain kinds of objects, as landscapes, views, animals, plants, flowers, scenes in common life. Pictures of genre, then, are pictures of a genus or kind as to subject; as landscapes, marine views, flower pieces, still-life, &c.

Ge´nera. Lat. Plural of genus.

Genus. Lat. A kindred, breed, race or family.

Ge´ology. From the Gr. ge, the earth, and logos, discourse. That branch of natural history which treats of the structure of the terrestrial globe. It is divided into descriptive geology; dynamic geology, which treats of the forces by which the surface of the earth has been modified; practical and economic geology, embracing the application of geological science to mining, road-making, architecture, and agriculture.

Geother´mal. From the Gr. ge, the earth, and thermos, heat, temperature. Relating to the temperature of the earth.

Gera´rdia. Proper name. A genus of plants of the family of Scrophulárieæ.

Germina´tion. The process of the development of the seed, and the embryo which it contains.

Gey´sers. From an Icelandic word, signifying raging or roaring. Celebrated spouting fountains of boiling water in Iceland.

Gibbosa. Lat. Gibbous; having protuberances or bunches.

Gibralta´rica. Lat. Belonging or relating to Gibraltar.

Gileade´nsis. Lat. Belonging or relating to Gilead.

Gla´cial. Belonging or relating to ice.

Gla´ciers. Fr. Masses or beds of ice formed in high mountains, derived from the snows or lakes frozen by the continued cold of those regions.

Gladio´lus. A genus of plants of the family of Iri´deæ.

Gland. An organ formed for the purpose of secreting a peculiar fluid.

Glau´cous. From the Gr. glaukos, blue. Applied to the bluish and pulverulent aspect which certain plants present, such as the leaves of cabbages, &c. Also used to signify the bloom of the color of cabbage leaves, sometimes observed on polished bodies.

Gledi´tschia. A genus of plants of the family of Leguminósæ, named in honor of J. G. Gleditsch, a German botanist. It includes the Honey and Swamp locust trees among its species.

Globba´ria. From the Lat. globum, a ball. A genus of insects: also a specific name.

Gluci´num. A metal discovered in glucina in 1798 by Vauquelin.

Glu´ten. Lat. The viscid elastic substance which remains when wheat flour is wrapped in a coarse cloth, and washed under a stream of water, so as to carry off the starch and soluble matters. It exists in many plants and in animals. It is the basis of glue.

Glyce´ria. A genus of plants of the family of grami´neæ, and the tribe Festucáceæ.

Gly´cine. From the Gr. glukus, sweet. A genus of plants of the family of Papilionáceæ.

Gnapha´lium. From the Gr. gnaphalion, the cotton tree. A genus of plants of the family of Compositæ.

Gneiss. Germ. A rock resembling granite. It is composed chiefly of feldspar and mica, and is more or less slaty in its structure. Gneiss is used for building and flagging.

Gold. The most valuable and longest known of the metals.

Goode´nia. Proper name. A genus of plants of the family of Goodeniáceæ.

Gordo´nia. Proper name. A genus of plants of the family of Gordonieæ.

Grandiflora. Lat. Large-flowered.

Grami´neæ. Lat. Grasses. A family of monocotylédonous plants, containing about 3000 species.

Græca. Lat. Greek.

Gra´nular. Composed of grains.

Granite. A rock which is a crystaline aggregate of quartz, feldspar, and mica.

Granitic. Of the nature of granite.

Greenstone. A rough variety of trap-rock, consisting chiefly of hornblende.

Grit. A coarse-grained sandstone.

Guilandi´na. A proper name. A genus of plants of the family of Leguminósæ. Guilandina Bonduc, the oval-leaved Nicker-tree.

Guineaen´sis. Lat. Belonging or relating to Guinea.

Gymno´tus. From the Gr. gumnos, naked, and nôtos, back. A genus of fishes.

Gypsum. Native sulphate of lime. It is converted into plaster of Paris by heat.

Gyro´phora. From the Gr. guros, a circle, and pherô, I give. A genus of cryptógamous plants.

Habitat. Lat. He inhabits. Used to designate the place in which animals and plants are naturally found.

Halio´tis. From the Gr. als, the sea, and ous, the ear. A genus of mollusks.

Ha´lcyon. From the Gr. alkuo´n, a king-fisher. A genus of birds.

Helia´nthus. From the Gr. elios, the sun, and anthos, flower; sunflower.

Heli´acal. From the Gr. elios, the sun. Relating to the sun. When a star rises so as to be visible in morning twilight before the appearance of the sun, it is said to rise heliacally.

Hep´taphyllum. From the Gr. epta, seven, and phulon, a leaf. Seven-leaved. A specific name.

Herba´ceous. In botany, Herb-like; that perishes every year. An annual stem. Not woody.

Herbivo´ra. Lat. Herbivorous.

Herbivo´rous. From the Lat. herba, a plant, and vorare, to eat. Plant eating. Applied to animals which feed chiefly or exclusively on plants or herbs.

Heritie´ra. Proper name. A genus of plants of the family of Sterculiáceæ.

Hibernate. From the Lat. hibernare, to winter. Animals which retire and sleep throughout the winter, are said to hibernate.

Hibi´scus. A genus of plants of the family of Malváceæ.

Hieroch´loa. From the Gr. ieros, sacred, and chloa, herb. A genus of plants of the family of Grami´neæ.

Hippopo´tamus. From the Gr. ippos, a horse, and potamos, river. River Horse. A genus of mammals.

Hirsu´ta. Lat. Hirsute; covered with soft hairs.

Hol´cus. A genus of plants of the family Grami´neæ.

Hopea, or Hoppea. Proper name. A genus of plants.

Ho´rrida. Lat. Horrid; spiny.

Ho´rary. From the Lat. hora, an hour. The motion of a celestial body, or the space it moves through in an hour, is termed its horary motion.

Horse-shoe magnet. A magnet in form of a horse-shoe.

Humi´ria. A genus of plants of the family of humoriáceæ. They inhabit tropical America.

Hydran´gea. From the Gr. udôr, water, and aggos, a vessel. A genus of plants of the family of Saxifragáceæ, and tribe of Hydrangéeæ.

Hydrau´lic. From the Gr. udôr, water, and aulos, a pipe. Relating to liquids in motion. Hydraulics is that branch of natural philosophy or physics which treats of the force of water and other liquids in motion.

Hydrosta´tic. From the Gr. udôr, water, and staô, I stand. Relating to water in a state of rest. Hydrostatics is the science which treats of the equilibrium and pressure of water and other liquids.

Hy´drogen. From the Gr. udôr, water, and gennaein, to generate. A colorless, tasteless, inodorous gas, one part of which, by weight, combined with eight parts of oxygen forms water;—combined with sulphur it constitutes sulphuretted Hydrogen;—and with carbon, carburetted Hydrogen, the gas used for illumination.

Hydrogeton. A synonym of Ouviraudra. A genus of aquatic plants.

Hyla. From the Gr. ule, wood, a tree. A tree frog.

Hymenæ´a. A genus of plants of the family of Papilionáceæ. A resinous tree of tropical America.

Hymeno´ptera. From the Gr. umen, a membrane, and pteron, wing. Systematic name of a class of insects, characterized by membranous wings.

Hy´rax. From the Gr. urax, a shrew mouse. A genus of mammals.

Ianthina. See Janthina.

I´bex. Lat. A wild goat. A genus of mammals.

I´bis. A genus of birds.

Igneous rocks. Are those rocks whose structure is attributable to the influence of heat, such as granite and basalt. They are distinct from stratified rocks, or those formed by deposits from water.

I´guana. A reptile of the lizard tribe.

Igua´nian. Applied to Saurians which resemble the iguana.

Igua´nodon. From iguana, and the Gr. odous, tooth. A genus of extinct or fossil reptiles of gigantic size discovered in the south of England.

I´lex. Lat. The Holly.

Ili´cis. Lat. Of the Holly; belonging or relating to the holly.

Im´bricate. Laid one over another like tiles.

Inconspicuus. Lat. Not conspicuous or remarkable.

Incisor. From the Lat. incido I cut. Applied to those teeth which occupy the anterior or centre of the upper and lower jaws, because they are used for cutting the food.

Inca. Designation of the aboriginal Peruvian princes; used as a specific name. Also, a genus of insects.

Indica—Indicus. Lat. Indian: Belonging or relating to India.

Indica´tor. Lat. Indicator; one who points out. A genus of birds.

Infuso´ria. Animals of infusions; microscopic animalcules.

Infuso´rial. Belonging or relating to the Infusoria.

Inorganic. Without organs or organization.

Insect. From the Lat. in, into, seco, I cut. Applied to animals whose bodies are cut, as it were, into three parts—head, thorax, and abdomen.

Irid´eæ. A family of monocotylédonous plants.

Iridium. From the Lat. iris, the rainbow. A grey, brittle, very infusible metal, which is found associated with the ores of platinum.

Isatis. From the Gr. isazô, I render equal. Woad. A genus of plants of the family of Cruciferæ. Also the name of a species of dog.

Isla´ndicus. Lat. Belonging or relating to Iceland.

Iso´geo´thermal. From the Gr. isos, equal, ge, the earth, and thermos, heat. Applied to lines which are supposed to pass through all parts of the earth’s structure on the surface where the mean heat is the same.

Isothe´rmal. From the Gr. isos, equal, and thermos, heat. Isothermal lines are supposed to pass through all places where the mean temperature of the air is the same.

Isotherial. From the Gr. isos, equal, and thereios, having the heat of summer. Isotherial lines are supposed to be drawn through all places having the same mean summer temperature.

Isochi´menal. From the Gr. isos, equal, and cheima, winter. Isochimenal lines pass through all places where the mean winter temperature is the same.

Ixia. A genus of plants of the family of Irideæ.

Janthi´na. From the Gr. ianthinos, violet. A genus of mollusks.

Japo´nica—Japo´nicus. Belonging or relating to Japan.

Jasper. A silicious mineral of various colors; sometimes spotted, banded or variegated. It takes a fine polish.

Jerbo´a. A genus of mammals of the family of Rodents, or gnawers.

Jura´ssic. Belonging or relating to the Jura mountains. Applied to a system of rocks of the middle secondary geological period. Also termed oolitic.

Ka´lmia. A genus of plants of the family of Ericáceæ.

Ker´ria. Proper name. A genus of plants of the family of Rosáceæ.

King´ia. Proper name. A genus of plants of the family of Joncáceæ, found in New Holland. Kingia australis; the grass tree.

Labia´tæ. From the Lat. labium, lip; in allusion to the form of the corolla. A family of dicotylédonous plants.

Lago´pus. From the Gr. lagôs, a hare, and pous, foot: hare-footed. A genus of birds of the order Gallináceæ.

Lam´antin. The manatus. A genus of mammals of the order of Cetácea.

Lamina´ria. A genus of aquatic plants of the family of Phy´ceæ.

Lamprato´rnis. A genus of birds. Lampratornis superba. A kind of raven.

Lana´ta. Lat. Woolly.

Lanceola´tus. Lat. Lanceolate; lance-shaped.

Landslip, or Landslide. In geology, the removal of a portion of land down an inclined surface, from its attachment being loosened by the action of water beneath, or by an earthquake.

Lanta´nium. A metal discovered in 1840 by Mosander.

Lapis lazuli. A mineral belonging to the aluminous silicates, of an azure blue colour.

Laureo´la. Specific name of a plant.

Latent heat. Heat not indicated by the thermometer, upon which the liquid and aëriform conditions of bodies depend, and which becomes sensible during the conversion of vapour into liquids, and of liquids into solids.

La´rva. Lat. A mask. The first state of an insect after leaving the egg.

La´rvæ. Lat. Plural of larva.

La´va. In geology, substances which flow in a melted state from a volcano. Lavas vary in consistence and texture.

Legumino´sæ. From the Lat. legumen, a bean. A family of plants.

Legu´minous. Belonging or relating to the Leguminoseæ.

Leoni´na. Belonging or relating to a lion.

Lepori´na. Lat. Belonging or relating to a hare.

Lepido´ptera. From the Gr. lepis, a scale, and pteron, a wing, scaly wings. An order of insects characterized by scaly wings.

Lesso´nia. Proper name. A genus of plants; also a genus of birds.

Leucade´ndron. From the Gr. leukos, white, and dendron, tree. A genus of plants of the family of Proteáceæ.

Lias. Provincial corruption of the word layers. In geology, a division of the secondary formation. It is also called the Liassic, Jurassic, and Oolitic system of rocks.

Li´chens. An order of cryptógamous plants. They include various mosses.

Lilia´ceous. Belonging or relating to the lily.

Lilia´ceæ. A family of plants.

Llanos. Span. Planes.

Limo´nia. A genus of plants of the family of Aurantiáceæ.

Limb. In botany, the spreading part or border of a leaf or petal. In astronomy, the outermost edge of the sun or moon.

Li´riode´ndron. From the Gr. leirion, a lily, and dendron, a tree. The tulip tree. A genus of plants of the family of Magnoliáceæ.

Li´thium. A metal.

Lo´asa. A genus of plants of the family of Loasáceæ.

Lobe. A term applied in botany to the more or less profound divisions of a leaf, corolla, or other part of a plant.

Lobelia´ceæ. In honor of Lobel, a botanist. A family of dicotylédonous plants.

Longifrons. Lat. Having a long front or forehead.

Lophobra´nches. From the Gr. lophos, a tuft, or crest, and branchia, gills. An order of fishes.

Lophopho´rus. From the Gr. lophos, a tuft, and phoros, bearer. A genus of birds of the order Gallináceæ.

Lora´nthus. From the Gr. lôron, a leather strap, and anthos, flower. Loranth. A genus of plants of the family of Lorantháceæ.

Lo´tus. A genus of plants of the family of Leguminósæ.

Loxia. A genus of birds.

Lu´teum. Lat. Yellow; dirty; made of clay. A specific name.

Macroce´phalus. From the Gr. makros, large, and kephale, head. A genus of insects. The specific name of a mammal.

Macrocy´stis. From the Gr. makros, large, and kustis, bladder. A genus of aquatic plants of the family of Phyceæ. Gigantic sea-weeds found in the southern hemisphere.

Macrou´rous. From the Gr. makros, great, and oura, tail. Having a long or large tail.

Magnet. Loadstone is the natural magnet, which has the property of attracting iron. Artificial magnets are prepared so as to possess the peculiar attractive properties of the loadstone.

Mag´netism. The science which investigates the phenomena presented by natural and artificial magnets, and the laws by which they are connected.

Magne´sium. A silvery white metal obtained from magnesia.

Magne´sian. Containing magnesia.

Magno´lia. Name of Magnol, a French botanist. A genus of plants of the family of Magnoliáceæ.

Ma´lachite. A mineral; native green carbonate of copper.

Mal´lotus. A genus of fishes of the family of Salmones. A genus of plants of the family of Euphorbiáceæ. A synonyme of the genus Rottlera.

Malu´rus. A genus of passerine birds.

Mam´mal. Any animal that suckles its young.

Mamma´lia. From the Lat. mamma, a breast. The name of the class of mammals or animals which suckle their young.

Mammi´feræ. Same as mammalia.

Mana´ti. Lat. Plural of manatus.

Mana´tus. A genus of mammals. The Lamantin.

Mangane´se. A metal.

Mariti´ma. Lat. Maritime; relating to the sea.

Marl. Argillaceous carbonate of lime. There are several varieties of marl.

Marsu´pial. From the Lat. marsupium, a pouch. Any animal having a peculiar pouch in front or on the abdomen.

Mas´todon. From the Gr. mastos, a nipple, and odous, a tooth. A genus of extinct mammals allied to the elephant.

Ma´trix. In geology, the stony substance or bed in which metallic ores and crystaline minerals are embedded. The gangue.

Mauri´tia. Lat. Belonging to the island of Maritius.

Mauro´rum. Lat. Of the Moors.