Abdomen, 129.
Aberration, chromatic, 173.
Aberration, spherical, 172.
Acalephæ, 153.
Acarus, 131.
Accumbent, 44.
Achromatic, 178.
Achromatic condenser, 5.
Achromatism, 177.
Acicular, 24.
Acotyledons, 43.
Acrocarpi, 55.
Acrostalagmus, 111.
Actinocyclus, 80.
Actinophrys, 156.
Adapter, 2.
Adulteration, 23.
Æcidium, 100.
Agaricus, 97.
Albumen, of seeds, 43.
——, of eggs, 113.
Algæ, 64.
Alyscum, 161.
Amœba, 155.
Amphileptus, 162.
Angiocarpi, 94.
Angle of vision, 175.
Anguillula, 152.
Angular, 23.
Animal tissues, 113.
Ankistrodesmus, 74.
Annular vessels, 27.
Annulus, of Ferns, 50.
——, of Fungi, 98.
——, of Mosses, 55.
Anoplura, 135.
Ant, 143.
Antennæ, of Entomostraca, 127.
Antennaria, 111.
Anthers, 37, 39.
Antheridia, of Algæ, 65.
——, of Ferns, 52.
Antheridia, of Mosses, 61.
Anthophysa, 160.
Antlia, 145.
Apex, 37.
Aphis, 146.
Apiculate, 101.
Aplanatic, 177.
Aplanatism, 176.
Apothecia, 92.
Apple-pulp, 19.
Apple, skin of, 41.
Arachnida, 130.
Arcella, 156.
Archegonia, of Ferns, 52.
——, of Mosses, 62.
Arcuate, 78.
Areolæ, 116.
Areolar tissue, 116.
Arrow-root, 23.
Arteries, 114.
Articulata, 127.
Asci, of Fungi, 97.
——, of Lichens, 92.
Ascomycetes, 107.
Ash, 25.
Aspergillus, 106.
Aspidium, 50.
Astasia, 160.
Atropos, 145.

Bacterium, 86.
Balsam, garden-, 25.
——, Canada, 12.
Bark, 36.
Basidia, 98.
Bast, 26.
Batrachospermeæ, 72.
Batrachospermum, 72.
Beards of Oyster, 125.
Bee, 143.
Beetles, 146.
Bermuda deposit, 81.
Bipinnatifid, 50.
Bivalve, 128.
Blood, 114.
——, of Birds, 119.
——, of Fishes, 121.
——, of Reptiles, 120.
Blood-corpuscles, 111.
Blood-worm (Chironomus), 143.
Blue-bottle, 137.
Blue mould, 106.
Bone, of Birds, 119.
——, of Reptiles, 120.
——, of Mammals, 114.
Bordered dots, 28.
Bothrenchyma, 28.
Botrytis, 105.
Branchiæ, 125.
Bread, 23.
Bryozoa, 125.
Bryum, 59.
Buds, 47.
Bug, 145.
Bull’s-eye, 6.
Bunt, 102.
Butterflies, 144.

Cabbage-butterfly, 145.
Calicium, 94.
Calyptra, 55.
Calyx, 37.
Calcareous, 66.
Camera lucida, 18.
Campylodiscus, 78.
Canaliculi, 115.
Cancelli, 114.
Capillaries, 114.
Capillary, 69.
Carapace, 127.
Caraway, 41.
Carpels, 41.
Cartilage, 115.
Caterpillars, 145.
Cell-contents, 21.
Cell-formation, 29.
Cells, 19.
Cell-wall, 19.
Cellular tissue, animal, 116.
—— tissue of plants, 20.
Cement, 16.
Cephalothorax, 130.
Ceramiaceæ, 69.
Ceramidia, 66.
Ceramium nodosum, 69.
—— rubrum, 70.
Cercomonas, 159.
Chætomium, 110.
Chætophoraceæ, 71.
Chara, 88.
Cheese-mite, 131.
Chelate, 131.
Chickweed, 37.
——, seeds of, 42.
Chilodon, 162.
Chin of Insects, 147.
Chironomus, 143.
Chitine, 136.
Chloride of calcium, 15.
Chlorococcum, 87.
Chlorophyll, 21.
Chrysalis, 141.
Chrysanthemum, 25.
Cilia, 52, 157.
Circulation in Plants, 31.
Cladonia, 93.
Cladophora, 71.
Classification, 164.
Clavarini, 99.
Clavate, 147.
Closterium, 74.
Coarse movement, 2.
Coccidia, 69.
Coccinella, 147.
Cocconeis, 79.
Cocoa-nut fibre, 26.
Cœlenterata, 153.
Coleochæte, 72.
Coleoptera, 146.
Coleps, 163.
Collomia, seeds of, 42.
Colpoda, 161.
Columella, of Mosses, 62.
——, of Mucor, 111.
Complementary colours, 183.
Compound animals, 126.
Concentric, 114.
Conceptacles, of Algæ, 65.
Conduplicate, 44.
Conferva bombycina, 71.
—— floccosa, 71.
Confervaceæ, 70.
Confervoideæ, 70.
Conidia, 100.
Coniferæ, 26.
Coniomycetes, 99.
Conjugation, 73.
Continuous, 103.
Convolvulus, pollen of, 39.
Coral, 153.
Corallina, 66.
Corallinaceæ, 66.
Corallines, 66.
Coremium, 106.
Corolla, 37.
Coscinodiscus, 81.
Cotton, 118.
Cotton-plant, 33.
Cotyledons, 43, 44.
Covers, 6.
Coxa, 139.
Crenate, 50.
Crocus, pollen-tubes of, 40.
Cruciferæ, 44.
Crustacea, 127.
Crustaceous, 91.
Cryptogamic plants, 48.
—— ——, seeds of, 43.
Ctenoid, 121.
Cucumber, 42.
Culex, 141.
Culm, 34.
Cuneate, 79.
Cup-moss, 93.
Curculionidæ, 149.
Cycloid, 121.
Cyclops, 128.
Cypris, 128.

Dacrymyces, 99.
Daphnia, 129.
Dasya, 68.
Day-flies, 145.
Deal, 26.
Delesseria, 69.
Dematiei, 104.
Desmidiaceæ, 73.
Diamond-beetles, 149.
Diaphragm, 3.
Diatoma, 78.
Diatomaceæ, 75.
——, fossil, 82.
——, markings on, 81.
——, preparation of, 82.
Dichotomous, 67.
Dicotyledons, leaves of, 35.
——, seeds of, 43.
——, stems of, 35.
Dicranum, 57.
Differentiation, 47.
Dimidiate, 55.
Dinobryina, 160.
Dinobryon, 160.
Diœcious, 38.
Dipping-tubes, 4.
Diptera, 137.
Dispersion, 178.
Division, spontaneous, 159.
Dothidea, 108.
Dragon-flies, 145.
Draparnaldia, 71.
Dry rot, 98.
Ducts, 27.
Dung-beetle, 132.
Dytiscus, 148.

Eccremocarpus, seeds of, 42.
Echinodermata, 153.
Echinus, 153.
Elbowed, 149.
Elder, 25.
Elements, vegetable, 19.
Elytra, 147.
Emarginate, 146.
Embryo, 42.
Embryo-sac, 46.
Embryonal vesicles, 46.
Enchelys, 161.
Encysting, 159.
Endogenous, 29.
Endogens, leaves of, 35.
——, seeds of, 44.
——, stems of, 44.
Enteromorpha, 87.
Entomostraca, 127.
Entozoa, 151.
Ephemera, 145.
Epidermis, animal, 117.
——, vegetable, 31.
Epithemia, 77.
Equisetum, 34.
Erector, 5.
Erysiphe, 110.
Euglena, 160.
Excipulum, 92.
Excurrent, 57.
Exogenous, 29.
Exogens, leaves of, 35.
——, seeds of, 43.
——, stems of, 35.
Eye-pieces, 4, 179.
Eyes, compound, 138.

Facets, 138.
Favellæ, 70.
Feathers, 119.
Feathery, 127.
Femur, 139.
Ferns, 49.
——, reproduction of, 51.
Fertilization, 45.
Fibro-cellular tissue, 25.
Fibro-vascular tissue, 31.
Field, 7.
Filament, 37.
——, flagelliform, 159.
Fine movement, 2.
Fish-crystals, 122.
Flagelliform, 159.
Flax, 26, 118.
Flea, 136.
Flocci, 103.
Florideæ, 66.
Floscularia, 151.
Flowers, 37.
Flustra, 126.
Fly, 138.
Fly-blows, 139.
Focus, 171.
Foot-jaws, 127.
Foramen, 45.
Foramina, 114.
Foraminifera, 156.
Forceps, 4.
Forked veins, 50.
Fovilla, 160.
Fragilaria, 78.
Fronds, 49.
Fruit, 40.
Frustules, 75.
Fucoideæ, 64.
Fucus, 65.
Fulcra, 110.
Funaria, 58.
Fungi, 96.
Funiculus, 45.
Fusiform, 110.

Galls, 111.
Gamasus, 132.
Gasteromycetes, 99.
Gemmation, 159.
Gentles, 140.
Geranium, leaf of, 21.
——, petals of, 20, 38.
Germinate, 43.
Gills, of Fungi, 97.
——, of Mollusca, 125.
Glands, 40.
Glandular, 31.
—— tissue, 26.
Glœocapsa, 88.
Glumes, 37.
Glycerine, 14.
Gnats, 141.
Gomphonema, 79.
Gonidia, of Algæ, 71.
——, of Lichens, 92.
Gonium pectorale, 83.
—— tranquillum, 84.
Grape-Fungus, 105.
Graphis, 94.
Green fly, 146.
Gristle, 115.
Groundsel, 33.
Guard-cells, 34.
Gymnocarpi, 94.
Gymnostomum, 56.
Gyrosigma angulatum, 80.
—— attenuatum, 79.

Hairs, 31.
——, animal, 117.
Hart’s-tongue Fern, 51.
Harvest-bug, 132.
Haversian canals, 114.
Helvellacei, 107.
Hemiptera, 145.
Hemp, 26.
Hermaphrodite, 38.
Heteromita, 160.
Hilum, 22.
Hoop, 76.
Humble Bee, 144.
Hundred-legs, 133.
Hyalotheca, 74.
Hydnei, 99.
Hydra, 153.
Hymenium, 98.
Hymenomycetes, 97.
Hymenoptera, 143.
Hyphomycetes, 103.
Hypnea, 69.
Hypnum, 60.
Hysterium, 108.

Illumination, 8.
Imago, 141.
Imbricate, 56.
Incumbent, 44.
Indusium, 51.
Inflated, 110.
Infusoria, 157.
Injection, 116.
Innovations, 55.
Insects, 133.
Intercellular passages, 20.
Intercellular spaces, 20.
Iodine, 22.
Isaria, 104.

Jania, 67.
Jaws, of Insects, 147.
Joints, of Insects, 136.
Jute, 26.

Knife, 4.

Labels, 17.
Labial palpi, 134.
Labium, 147.
Labrum, 147.
Lacunæ, 115.
Lady-bird, 147.
Lanceolate, 78.
Leaves, 31.
Legs, of insects, 139.
Lenses, 170.
Lentil, 23.
Lepidoptera, 144.
Lepisma, 134.
Liber, 26, 35.
Lice, 135.
Lichens, 91.
Lieberkuhn, 7.
Light, 167.
Lime, 25.
Lips, of insects, 147.
Lirellæ, 94.
Lithobius, 133.
Lithocystis, 67.
Live-box, 4.
London pride, anthers of, 39.
Longitudinal, 30.
Lunate, 147.
Lyngbya, 85.

Magnification, 175.
Magnifying power, 17.
Mammalia, 113.
Mandibles, of insects, 147.
——, of Spiders, 130.
Mantle, 123.
Marrow, 114.
Matrix, 91, 96.
Maxillæ, 147.
Medium, 168.
Medulla, 35.
Medullary sheath, 35.
Melanosporeæ, 64.
Melobesia, 67.
Melosira, 79.
Membrane, 31.
Membranipora, 126.
Mentum, 147.
Merulius, 98.
Micrasterias, 74.
Micropyle, of seeds, 46.
Microscope, 1.
——, simple, 5.
Midrib, 50.
Mignonette, seeds of, 42.
Mildew, 101.
Mirror, 2, 3.
Mitriform, 55.
Mollusca, 122.
Monadina, 159.
Monas, 159.
Moniliform, 31.
Monocotyledons, leaves of, 35.
——, seeds of, 43.
——, stems of, 36.
Monœcious, 38.
Mosses, 54.
Moths, 144.
Mould of paste, 111.