574 



INDEX 



400; respiratory system of, 62; 

 sections of , 40, 43 ; sexual union in, 

 54; skeletal system of, 69; sound 

 production in, 21; summary of 

 activities of, 150; urinogenital 

 system of, 52; venous system of, 

 67. 



Frontal ganglion, of locust, 359. 



Frontonia, 154, 189. 



Fungi, 32. 



Gall fly, 387. 



Gallus bankiva, 523. 



Galton, 457. 



Galton's Laws, 458. 



Gametes, 174, 214, 220, 223, 231; 



see also Germ cells. 

 Ganglion, 149, 298; of dorsal root, 



108. 

 Gastric caecum, 354. 

 Gastric gland, 82. 

 Gastric juice, 82. 

 Gastropoda, 241. 

 Gastrotricha, 241. 

 Gastro- vascular cavity, 261; see also 



Enteron. 

 Gastrula stage, 243, 281; of Amphi- 



oxus, 399; of frog, 405, 406, 408. 

 Gastrulation, 398, 408, 427. 

 Gemmulation, 219. 

 Gene, 139, 474, 475, 485, 486. 

 Generations, alternation of, 277. 

 Genetics, 3, 6, 130, 456; in relation to 



evolution, 485; in relation to 



human affairs, 487. 

 Genus, 12. 

 Geographical distribution, 5, 507, 



519. 

 Geologic succession of organisms, 



491, 509, 513, 515, 529. 

 Geological distribution, 5, 507. 

 Geotropism, 304. 

 Germ cell cycle, 222. 

 Germ cells, 199, 216, 223; of frog, 



400, 402; of Hydra, 271, 400; 



origin of, 223, 224; primordial, 



223, 224; see also Gametes. 

 Germ layers, 281, 409; derivatives 



of, in earthworm, 309; derivatives 

 of, in frog, 417. 



Germinal continuity. Theory of, 222. 



Germinal disc, 426. 



Germplasm, 217, 223; early differen- 

 tiation of, 224; Theory of con- 

 tinuity of, 222. 



Giant fibers, 301. 



Gigantism, 101. 



Gill bars, 45; clefts or slits, 45, 398, 

 414; plate, 410, 413, 414. 



Gills, 45, 62, 92, 324; of tadpole, 

 414. 



Giraffe, 542. 



Gizzard, of earthworm, 292. 



Gland cells, 142; of earthworm, 300; 

 of Hydra, 251, 260. 



Glands, digestive, 51, 82, 83; ductless 

 or endocrine, 97, 98; with ducts, 

 97, 142. 



Glomerulus, 52, 53, 95. 



Glottis, 48, 62. 



Glycerol, or glycerine, 73. 



Glycogen, 89. 



Goblet cells, 142, 150. 



Golgi elements, 135. 



Gonads, 102; see also Reproductive 

 organs. 



Gonionemus, 265, 266, 277, 278. 



Gonium, 197, 198, 199, 215. 



Gorgoderina, 22. 



Graptolites, 277. 



Grass frog, 16; see also Rana pipiens. 



Grasshopper, short-horned, see Locust. 



Gregaloid colonies, 195, 196. 



Gregarina, 154, 191. 



Green frog, 12, 15. 



Green plant, as source of food supply, 

 32. 



Growth, 76. 



Gryllus, 361, 377. 



GuUck, 563. 



Gullet, in Protozoa, see Cytopharynx. 



Gut cavity, see Enteron. 



Gymnophiona, 12, 14. 



Habit, 113. 

 Haemoccele, 331, 353. 



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