INDEX 



Glaciations, of Pleistocene, 640, 641, 644 



Gland cells, in Hydra. 292 



C;iancis, 60, 90, 95, 101; alveolar, 60; of in- 

 ternal secretion, 95; tubular, 60 



CJlandular epithelium, 60 



(ilobi^eruin, 237 



(Jlochidium, 377, 378 



C;iomerulus, 58, 83; o[ Saccoalo.ssus, 542 



(ilossobalaniis, 542 



Glottis, 48, 55 



CJIuca^on, 120 



Glucose, 26, 30, 35, 37, 74, 75, 77, 84, 120, 

 121, 122 



Glutathione, in feeding of Hydra. 295 



Glycerol, 26, 72, 76 



Glycogen, 20, 26, 30, 35, 77, 114, 120, 122; in 

 Ascaris, 352; in crayfish, 430; in insect fat 

 body, 455 



Glycoproteins, 27 



Glycosidic linkage, 26 



Goblet cells, 60 



Goitre, 119 



Golgi apparatus, 21 



Gompholhernim. 629 



Gonadotropic hormones, 1 1 8 



Gonads, 95; in Hydra, l^^l . 298, 299; in 

 Scvphomedusae, 305 



Gonanth, 301, 302 



Gomahles. 624 



Gomonemus . 295, 302 



Gomum. 265, 266 



Gonophores, 302 



Gonotheca, 301, 302 



Gonozooids, Physalia. 304 



Goose barnacle, 438, 439 



Gooseflesh, 126 



Goraonia. 309 



Gorilla, 586, 638 



Grade of organization, 222 



Graded response, 99 



Gradual metamorphosis, in insects, 454 



Granha. 281 



Graptolites, 543, 544 



Graptolithina, 540 



Grasshopper, see Locust 



Gray crescent, 148 



Gray matter, 96, 98, 101 



Green frog, 567 



Green gland, of crayfish, 432, 433; of crusta- 

 ceans, 519 



Greenland, and fossil amphibians, 561 



Greg^arina. 245 



Grouper, 560 



Growth, 13, 29, 30, 32, 145; and differentia- 

 tion hormone, 527; in hvdra, 299 



Growth hormone, 118 



Growth period, 136, 138 



Gryllm. 462 



Guanaco, 631 



Ciuinea pigs, inheritance in, 180, 181 



Gulick, John T., 652 

 Gullet, 249 

 Gustatory cells, 110 

 Gymnophiona, 564 

 Gymnolhorax. 560 

 Gynanders, bilateral, 210 

 Gyrocolyle. 334 



Habitat relations, of annelids, 396; of arthro- 

 pods, 423; of coelenterates, 285; of hvdra, 

 286 



Haeckel, Ernst, 313 



Haemal system, 505 



Hagfishes, 541, 555 



Hair, as insulating material, 598 



Hair cells, 108 



Hair follicle, 83 



Half-chromosomes, 43, 136 



Haltere, 474, 475 



Halteria. 258 



Haploid individuals, 211; in honeybee, 472 



Haploid number, 136 



Hard palate, 48 



Haversian canal, 63 



Haversian system, 63 



Hawaii, 632; snails of, 652 



Head, 91; of spermatozoon, 137 



Hearing, 108 



Heart, 48, 51, 90, 92; of cravfish, 432; origin 

 of, 514 



Heart beat, 117, 121 



Heart urchin, 502 



Heat, 37, 54, 125; conservation of, 77; effect 

 on cells, 597; loss of, 125 



Heat control, 103, 125 



Heat production, 126 



Hedgehog, 579 



Heidelberg man, 642 



Heliozoa, 236 



Hellbender, 563, 564 



Hemichordata, 216, 219, 221, 368. 538, 539, 

 540, 542-545 



Hemimctabolous development, 455; in drag- 

 onfiies, 459 



Hemiptera, 462, 463; fossil, 620; wings of, 

 457 



Hemocoel, 514, 515; in arthropod e\olution, 

 485; of crayfish, 431 



Hemoglobin, 27, 63, 81, 84; in earth\Norm, 

 406; in .\ereis. 400 



Hemophilia, 199 



Hermaa. 497 



Hen's ee;g, development of, 132 



Heparin, 64 



Hepatic portal vein, 51, 77 



Herbivorous animals, in food chains, 606 



Hereditary factors, 182 



Heredity, 172, 649 



Heritable variations, 201 208 



Hermaphroditism, 208; significance of, 534 



691 



