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.