Moulds, 96.
Mounting, 10.
Mouth of insects, 147.
Mucedines, 105.
Mucor, 111.
Muscles, 115.
Mushroom, 97.
Mustard and cress, 43.
——, cotyledons of, 44.
Mycelium, 96.
Myriapoda, 133.

Nacre, 123.
Nassula, 162.
Needles, mounted, 4.
Nemaspora, 100.
Nerves, of leaves, 31.
Neuroptera, 145.
Newt, 120.
Nicol’s prism, 6, 184.
Nitella, 88.
Nitzschia, 78.
Nodding, 59.
Nodule, 79.
Nostoc, 86.
Nucleolus, 21.
Nucleus, 21.
——, of Infusoria, 159.
——, of ovule, 45.

Oak-apple, 111.
Oat, 23.
Object-glasses, 2.
Oblique, 30.
—— light, 9.
Obovate, 57.
Obtuse, 50.
Ocelli, of Spiders, 130.
Oidium, 105.
Opegrapha, 94.
Operculum, 55.
Optic axes, 183.
Orange, rind of, 40.
Organs, vegetable, 31.
Oscillatoria autumnalis, 84.
—— nigra, 85.
Oscillatoriaceæ. 84.
Ovary, of animals, 137.
—— of plants, 37, 40.
Ovate, 56.
Ovigerous vesicles, 154.
Ovisacs, 154.
Ovules, 45.
Ovum, 113.
Oxytricha, 161.
Oyster-shell, 123.

Paleæ, 37.
Palmella, 88.
Palmellaceæ, 87.
Palpi, of insects, 147.
Papilla, 39.
Papillæ, of skin, 116.
Papillose, 39.
Paramecium, 161.
Paraphyses, 61.
Parenchyma, 20.
Parmelia, 91.
Pear, 29.
Pearls, 123.
Pectinate, 69.
Pediastrum, 74.
Pedicels, 103.
Pencil, 128.
Penicillium, 106.
Perianth, 37.
Pericarp, 40.
Perichætial, 60.
Peridiola, 110.
Peridium, 99, 100.
Perigonial, 61.
Perispore, 65.
Peristome, 55.
Perithecium, 107.
Petals, 37, 38.
Peziza, 107.
Phases, 184.
Phragmidium, 101.
Physarum, 99.
Physomycetes, 110.
Pigment, 117.
Pileus, 97.
Pinnæ, 51.
Pinnate, 51.
Pinnatifid, 50.
Pinnularia, 79.
Pinnules, 51.
Pistil, 37.
Placenta, 45.
Pleurenchyma, 26.
Pleurocarpi, 55.
Pleurosigma, 79.
Plocamium, 69.
Plumose, 127.
Plum-stone, 29.
Plumule, 43.
Podetia, 93.
Podophrya, 162.
Podura, 134.
Polariscope, 6.
Polarization of light, 180.
Pollen, 37.
Pollen-granules, 39.
Pollen-tubes, 40.
Polycystina, 156.
Polypi, 153.
Polypidom, 125.
Polypodiaceæ, 50.
Polypodium, 50.
Polyporei, 99.
Polysiphonia, 68.
Polytrichum, 58.
Polyzoa, 126.
Polyzoary, 126.
Poppy, seeds of, 42.
Pore, 109.
Pores, in wood, 28.
Porous cells, 25.
Potato, 22.
Potato-fungus, 105.
Primine, 45.
Primordial utricle, 21.
Primrose, pollen of, 39.
Prismatic, 24.
Proboscis, 146.
Prolegs, 145.
Prosenchyma, 25.
Prothallium, 51.
Protoplasm, 21.
Protozoa, 155.
Pterodina, 151.
Puccinia, 101.
Puff-balls, 99.
Pulex, 135.
Pulvilli, 139.
Puncta, 79.
Pupa, 141.

Quadrate, 147.

Racodium, 111.
Radiata, 153.
Radicle, 43.
Ramenta, 49.
Raphides, 24.
Receptacles, of Algæ, 65.
——, of secretion, 40.
Red Spider, 132.
Reflexion, 169.
Refraction, 168.
Reindeer moss, 93.
Reproductive organs, 48.
Reptiles, 120.
Resting spores, 83.
Reticulated, 54, 129.
—— vessel, 27.
Rhabdonema, 80.
Rhinotrichum, 107.
Rhizome, 49.
Rhizopoda, 155.
Rhodomelaceæ, 67.
Rhodospermeæ, 66.
Rhodymeniaceæ, 69.
Rhubarb, 25.
Rice, 23.
Richmond earth, 82.
Rings, annual, 36.
Roe of fishes, 122.
Rootlets, 36.
Roots, 36.
Rostrate, 56.
Rostrum, 131.
Rotating disk, 6.
Rotation, 31.
Rotatoria, 149.
Rotifer, 150.
Rotifera, 149.

Sacculi, gastric, 158.
San Fiori deposit, 82.
Sarcode, 155.
Scalariform ducts, 49.
Scales, of fishes, 121.
——, of Podura, 134.
——, of insects, 144.
Scar of seeds, 46.
Scenedesmus, 74.
Schizogonium, 86.
Scolopendrium, 51.
Sea-weeds, 64.
Sections, 30.
Secundine, 45.
Seeds, 42.
Selenite, 24.
Sepals, 37.
Septa, 99.
Septate, 100.
Serrate, 51.
Sertularia, 154.
Sessile, 54.
Setaceous, 133.
Setæ, 129.
—— of Infusoria, 158.
Shell, 122.
Side condenser, 6.
Silk, 118.
Simple microscope, 5.
Sines, 168.
Siphonaceæ, 84.
Skin, 116.
Slides, 6.
Smut, 102.
Snapdragon, petals of, 39.
Snowberry, 42.
Sori, of Ferns, 50.
Spawn, of Fungi, 97.
Spectrum, 173.
Spermatia, 93.
Spermatozoa, of Algæ, 65.
——, of Ferns, 52.
——, of Fishes, 122.
——, of Mosses, 61.
Spermogonia, of Fungi, 101.
——, of Lichens, 92.
Sphæria, 109.
—— fragiformis, 104.
Sphagnum, 56.
Spicula, 157.
Spiders, 130.
Spiderwort, 31.
Spinnerets, 131.
Spiracles, 134.
Spiral cells, 25.
Spiral vessels, 27.
Spirit-lamp, 5.
Spirogyra, 72.
Spirulina, 85.
Sponges, 156.
Spongidæ, 156.
Sporangium, of Ferns, 54.
Spores, 50.
Sporocybe, 104.
Sporophylles, 69.
Stage, 2.
Stamens, 37.
Starch, 22.
Starfishes, 153.
Stellate, 31.
Stems, 35.
Stentor, 163.
Sterigmata, 98.
Steropus, 146.
Stichidia, 68.
Stigma, 37.
Stilbacei, 103.
Sting, of Wasp, 144.
Stinging-organs, 154.
Stings, 33.
Stipes, 76, 97.
Stomata, 34.
Stomoxys, 141.
Striated, 33.
Stroma, 108.
Struma, 58.
Style of plants, 37.
Stylospores, 100.
Suctorial, 135.
Suture, 73, 76.
Synedra, 78.
Synura, 83.

Tabellaria, 79.
Tabular, 83.
Tangential, 30.
Tape-worm, 152.
Tarsus, 139.
Tentacles, 124, 153.
Testa, 42.
Tetraspores, 167.
Thalamium, 92.
Thallus, 91.
Thecæ, 50.
Thorax, 129.
Thread-worm, 152.
Tibia, 139.
Tissues, vegetable, 19.
Toad-stools, 96.
Tongue, of Mollusca, 123.
Tortula, 57.
Torula, 100.
Tourmaline, 181.
Tous les mois, 24.
Trabeculæ, 59.
Tracheæ, 134.
Trachelomonas, 160.
Tradescantia, 31.
Transverse, 148.
—— section, 30.
Tremellini, 99.
Trichothecium, 105.
Triton, 120.
Trochanter, 139.
Trombidium, 132.
Truffle, 108.
Truncated, 27.
Tuberacei, 108.
Tubercularia, 103.
Tuberculate, 101.
Tubular cells, 25.
Tufts, 25.
Turnip-fly, 146.
Turpentine, 27.

Ulothrix, 86.
Ulva, 87.
Ulvaceæ, 86.
Umbelliferæ, 41.
Uncorrected lens, 178.
Uniseptate, 101.
Uredo, 102.
—— candida, 102.
—— caries, 102.
—— linearis, 109.
—— rubigo, 109.
—— segetum, 102.

Vaginicola, 163.
Vaginule, 62.
Valve, 76.
Vascular tissue, 27.
Vaucheria, 84.
Vegetable elements, 19.
—— organs, 31.
Veil, 98.
Veins, of animals, 114.
——, of leaves, 31, 35.
Velum, 98.
Vertebra, 113.
Vertebrata, 113.
Vesicles, contractile, 159.
——, embryonal, 46.
Vessels, 27.
Vibrio spirillum, 85.
Vision, 174.
Vittæ, of seeds, 40.
Volva, 98.
Volvocineæ, 83.
Volvox, 83.
Vorticella, 162.

Wallflower, anthers of, 39.
Wasp, 143.
Water-beetle, 148.
Web, spider’s, 131.
Wheat, cotyledon of, 45.
Wheat-flour, 23.
Wheel-animalcules, 150.
Whelk, 123.
Wine-cellar Fungus, 111.
Winged seeds, 42.
Winter ova, 128.
Wood-cells, 25.
Wood-louse, 127.
Woody fibre, 25.
—— tissue, 25.
Wool, 118.

Xanthidia, 75.

Yeast, 106.

Zygnema, 72.
Zygnemaceæ, 2.
Zoospores, 71.