Cross fertilisation, 92, 102, 110, 118, 122, 151 Crow, 312, 318, 320; family, 312, 320 Crucifers, 95 Crustaceans, 372, 377 Cuckoo, 322, 324; cuckoo-pint, 122 Currants, 176, 179 Cushion-feet of caterpillar, 365 Daffodil, 84, 85, 120, 122 Daisy, 111, 112 Dandelion, 112, 113; fruit of, 171, 172 Deadnettle, 117 Deer, 261 Dentine, 219 Development of chick, 286, 289; of frog, 340 Diaphragm, 218 Diastase, 234 Dicotyledons, 23, 40, 72 Digestion, 231, 233; definition of, 233 Digestive canal of frog, 231; of rabbit, 232 Diptera, 370 Dispersal of insects, 370; of seeds, 165 Dissection, 214 Dog, 248, 251, 252, 254 Donkey, 261 Dorsal, 217 Down feathers, 273, 277 Dropwort, water, 108 Duck, 326, 327 Dytiscus, habits and structure of, 357, 358; life-history of, 361 Ear, of grass, 130 Ears, of rabbit, 218 Earthworms, 383, 384 Education of young animals, 248, 249, 262 Eggs, of cabbage-white butterfly, 362; of cockroach, 357; of Dytiscus, 361; of earthworm, 386; of frog, 339, 340, 341; of hen, 282, 284; of Limnaea, 380 Elm, 152, 153; fruit of, 171, 173 Embryo, 12; of chick, 287, 289; of fern, 188, 191; of horsetail, 195 Enamel, 219 Endosperm, 22 Evolution, a case of, 338 Extinct horsetails, 196 Eyes, of butterfly, 363, 367, 368; of cat, 246, 250; of cockroach, 348, 352; of crab, 373; of crayfish and lobster, 372; of dog, 248, 251; of pigeon, 271; of rabbit, 218; of snail, 379, 382 Falcon, 272, 330 Fantail pigeon, 280 Feathers of pigeon, 265, 266, 267, 270, 275, 276 Feelers, of butterfly, 363, 367; of cockroach, 349, 352; of crayfish and lobster, 372, 373, 374, 375; of Dytiscus, 358, 359; of moth, 364, 368, 369 Fehling’s solution, 230 Ferns, 183; bracken, 184, 189; hart’s tongue, 185, 190, 191; male fern, 183, 185 Fertilisation, 92; of ferns, 188; of forest trees, 146; of foxglove, 116; of grasses, 131; of horsetail, 195; of moss, 202; of oak, 145; of primrose, 109; of red clover, 101; of Scotch pine, 162 Fescues, 132, 134 Fieldfare, 303, 309 Field work, 388 Filament of stamen, 91 Fir, spruce, 161, 163 Flight of bird, 278 Flower, of a grass, 128, 129; of wallflower, 88, 89 Flowerless plants, 197 Flowers, work of, 89 Food, carbonaceous, of plants, 34, 35; mineral, of plants, 29; necessity of, 230; obtained from air, 31, 34; obtained from soil, 26, 29; of mushroom, 204, 206; of young seedling, 28 Fool’s parsley, 108 Fowls, 296, 299 Foxglove, 114, 115; family, 114, 115 Foxtails, 132, 134, 135 Frog, development of, 340; digestive canal of, 231; life of, 332, 334 Fronds of ferns, 65, 183, 184, 186, 189 Fruit, 166[Pg 430] of apple, 176, 179; of ash, 171, 173; of beech, 175, 178; of blackberry, 175, 179; of buttercup, 98; of cherry, 175, 179; of dandelion, 171, 172; of elm, 171, 173; of field geranium, 165, 168;
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