628 



ANIMAL BIOLOGY 



Fins, 188, 226, 319, 323, 362, 354, 366, 367, 373 



Fire and body compared, 480 



Fireflies, 283 



Fish lice, 267 



Fishes, 341-364, 365, 367, 502. 523, 530, 539, 



542, 543, 548 

 Fission, 67, 74, 107, 142, 253 

 Fissipedia, 436 

 Flagella, 79, 133, 494 

 Flagellata, 79 

 Flagellated cells, 137 

 Flagellated chambers, 132 

 Flame cells, 161, 173, 470, 494 

 Flatworms, 159-177, 466, 470-472, 490, 498 

 Fleas, 294, 525 

 Flex gliding, 411 

 Flexor muscles, bird, 414 

 Flicker, foot, 413 

 Flies, 280, 283, 287, 293, 613, 525 



foot, 279 

 Flight, 410-413, 435 

 Flight feathers, 405 

 Fluid, 9 



Flukes, 167-168, 172-177 

 Fluorine, 20 

 Flying dragon, 391, 392 

 Flying fish, 356 



squirrels, 433 



tail, 355 

 Flying foxes, 534 

 Flying spiders, 305 

 Follicle mites, 308 

 Food, 33-40, 42, 43, 65, 230, 294, 297-298. 



352, 374, 430, 482, 516 

 Food chains, 508 

 Food cycle, 508 

 Food vacuoles, 64, 70, 466, 488 

 Foot, 212, 213, 215, 221-225, 279, 326, 368. 389, 



404, 414, 432, 435, 451 

 Foramen, 193 

 Foraminifera, 82, 541 

 Forebrain, 334 

 Foregut, 467 

 Forest faunas, 512 

 Fossil men, 456 

 Fossilization, 538 

 Fossils, 538 



Four-o' clocks, inheritance, 562 

 Fovea centralis, 339 

 Fowls, domestic, 112, 420, 563 

 Foxes, 436, 534, 537 

 Fragmentation, 107, 171 

 Fraternal twins, 568 

 Fresh-water faunas, 512 

 Frog, 340, 370-381, 481 

 Frontal sinus, 335 

 Fruit fly (see Drosophila) 

 Fry, 362 



Functions, animal organisms, 486-496 

 Fungia, 154 

 Funiculus, 101 



Galen, 579, 581 

 Galileo, 581 



Gall bladder, 328, 329 



Gall flies, 292 



Gall gnats, 108 



Gall mites, 308 



Gall wasps, 292 



Galls, 291, 293 



Gametes, 45, 86, 89, 142, 475, 559, 532 



Gametocytes, 89 



Gametogenesis, 109, 142, 475, 546 



variations in, 113 

 Ganglia, 160, 161, 224, 244, 333, 472 

 Ganglionic synaptic nervous system, 473 

 Ganoid scales, 363, 354 

 Ganoids, 340, 350, 351. 542 

 Ganoin, 354 

 Gar pikes, 351 

 Gars, 351 



Garter snakes, 392, 509 

 Gases, 9, 491 

 Gastraea, 272 



Gastral cavity, 130, 132, 466 

 Gastral layer, 132 

 Gastric gland, 282 

 Gastric gland cells, 138 

 Gastropoda. 221, 222, 513 

 Gastrostomus hairdii, 363 

 Gastrovascular cavity, 137, 144, 160, 166, 466, 



574, 575 

 Gastrula, 121-124, 151, 218 

 Gastrulation. 121-124, 477 

 Gavials, 399 

 Geckos, 390 

 Geese, 419-423 

 Gel, 13, 14 

 Gemmation, 86 

 Gemmules, 134 

 Gene mutations, 563 



Genealogical tree (see Phylogenetic tree) 

 General physiology, 486—496 

 Generic names, 59, 573 

 Genes, 555-557, 559, 560, 562-565, 568 

 Genesis, 26 



Genetics, 6, 545, 555-569, 583 

 Genital atrium, 162, 163 

 Genital duct, 214, 216 

 Genital opening, 223 

 Genital pore, 159, 162, 163, 168, 170 

 Genotype, 556 

 Genotypic ratio, 560-561 

 Genus, 59 



Geographical distribution, 571 

 Geological ages, 540 

 Geological time scale, 539, 540 

 Geotropism, 56, 72, 74 

 Gephyrea, 247, 251, 252 

 Germ cells, 96, 109-113, 473-479 



division of labor, 113 



potential immortality, 479 

 Germ layers, 122, 123, 463, 574, 575 



(See also Ectoderm; Entoderm; Mesoderm) 

 Germ plasm, 96, 479. 545 

 Germinal area, 383 

 Germinal disc, 362 

 Germinal epithelium, 98 

 Giant fibers. 244 



