INDEX. 
2 59 
Decomposition of water, 26 
Definitions: see vocabularies 
Degeneration, no 
Dental formulae, 212 
Derivations: see vocabularies 
Diaphragm, 223 
Differentiation, 131 
Digestion, 128 
Digitigrade feet, 228 
Diptera, 64 
Discovery, 30 
Dispersals, 237 
Dissection of grasshopper, 34 
Distribution of animals, 236, 250 
Ditycus, 80, 87 
Division of labor, 131 
Dragon-fly, 60, 76 
Duckweed, 9 
E 
Earthworm, 7, 148 
Echinodermata, 142 
Ectoderm, 123 
Eggs of birds, 201 
“ “ frogs, 23, 188 
Elements, 27 
Elytra, 67 
Embryology, 246 
Enamel, 231 
Endoderm, 123 
Endopodite, 104, 107 
English sparrow, 197 
Entomostraca, 109 
Epidermis of mammals, 229 
Eustachian tube of frog, 181 
Excretion, 30 
Exopodite, 104, 107 
Experiments, 25 
F 
Facets, 33 
Families, 112 
Fauna, 237 
Feathers, 198 
Feet of birds, 198 
Femur of insects, 34 
“ “ man, 194 
Fertilization of plants by insects, 89 
Fibula, 167 
Fingers and toes of mammals, 224 
Fins of fish, 159 
Fishes, 169 
Fission, 118 
Flies, 6, 57 
Flight of birds, 202, 203, 204 
“ “ insects, 42 
Food of amoeba, 118 
“ “ butterfly, 5, 49 
“ “ caterpillar, 6, 48 
“ “ crayfish, 13 
“ “ earthworm, 150 
“ “ fish, 169 
“ “ fly, 6, 57 
“ “ frog, 7, 179 
“ “ grasshopper, 36 
“ “ hydra, 11, 128, 129 
“ “ leech, 13 
“ “ mussel, 8, 166 
“ “ slug, 7 
“ “ snail, 8 
“ “ spider, 6, 94 
“ “ starfish, 142 
“ “ tadpole, 13 
“ “ turtle, 7 
“ “ wasp, 5 
Foot of horse, 228 
Foraminifera, 120 
Formaldehyde, 19 
Fossils, 244 
Fresh-water mussel, 155 
Frog, 7, 179 
Frogs’ eggs 23, 186 
Fungi, a, 136 
G 
Galaxea, 136 
Ganglion, 36 
Gastropoda, 165 
Gastrula, 249 
Genealogical tree, 252 
Genera, 112 
Geological distribution, 237, 241 
Gill arches, 170 
“ clefts, 170 
*• filaments, 170 
“ slits, 170 
Gorilla, 220 
Grallatores, 208 
Grasshopper, 5, 32 
Growth of lungs in frogs, 187 
