INDEX 



421 



Gametes, distance traveled in sea-water, 

 289 

 survival, in sea-water, 289 



in fresh water, 284 

 allelocatalysis, 290 

 Gammariis, mass protection from salts, 



215 

 Gang as basis of society, 339, 348 

 Geese, Canada, flocks of, 342 

 Gelatine, protection from h^'potonic sea- 

 water by, 233 

 Gemmill, J. F., 263, 264, 268, 281, 284 

 Gentian violet, mass protection for 



bacteria against, 253 

 Gibbons, 347, 348 

 Giraffes, heterotypic groups, 30 

 Glaser, O., 264, 266 

 Glass, effect, on protozoans, 124 



on chemical reaction, 125 

 Glass rods, and oxygen consumption in 



Ophioderma, 192 

 Ghssiphonia, relation to young, 25 



mass protection from colloidal silver, 

 204, 211 

 Gnats, 12 

 Goetsch, W., 112, 113, .114, 116, 119, 125, 



245 

 Goldfinch, flocks, 343 

 Goldfish, mass protection from colloidal 

 silver, 209 

 from lead nitrate, 214 

 Goldman, E. A., 79 

 Goldschmidt, R., 309 

 Gorilla, 348 



Gould, H. N., 295, 296, 297, 298 

 Gounelle, E., 95 

 Gowell, 126 

 Crackles, 13, 342 

 Graham-Smith, G. S., 106 

 Grasse, P., 317 



Grasshoppers, migrating swarms, 34, 78, 

 316 

 synchronism in, 94 

 mass protection in, 236 

 host for nematode parasites, 299 

 morphological changes due to crowding, 



316 

 phase theory, 316 

 mass menace, 319, 329 

 experimental evidence, 327 

 Grassi, B., 313 



Grave, B. H., 6g, 289 

 Gray, J., 278, 279, 280, 281, 284, 285 

 Greenleaf, W. E., 167, 169, 170, 177 

 Gregarious tendency of grasshoppers, 316 



see Instinct, social 

 Gregariousness, in anthropoids, 347 

 Grosvenor, C. H., 304, 305 

 Growth, limited by crowding, loi 



snails, 108, 123 



echinoderms, no 



Daphnia, no 



tadpoles, 112 



Hydra, 112 



Planar ia, 113 



fish, 113, 116, 117 



summary of retarding factors, 118 

 stimulation by crowding, 147 



in tissue cultures, 149 



in echinoderms, 153 

 form, affected by crowding, 311 



in aphids, 313 



in grasshoppers, 316 



in Drosophila, 331 



Growth-inhibiting substance, no, 117, 

 n8, 153, 155, 165, 304 



Growth-promoting substance, of Semper, 

 108, 118, 248 

 in embryonic extracts, 150, 159 

 in hen's egg, 151 

 in echinoderms, 153 

 in yeast, 157 

 in green plants, 158 

 in aflelocatalysis, 165, 166, 167, 178 



Guest relations, 341 

 Gurwitsch, A., 96, 156, 215 

 Gynopaedium, 18, 24, 25 



Gyrinid beetles, aggregations of, 28, 60 

 reaction to patterns, 61 



Haberlandt, G., 151 

 Haemocera, see Copepoda 

 Hajos, K., 105 



Halictus, "sleep" aggregations, 76 

 Harmful effects of aggregations, see Ag- 

 gregations, harmful effects 

 Harnly, M. H., 134, 135, 334 

 Harrison, R. G., 150 

 Hartmann, O., 304 

 Haswell, W. A., 291 

 Hatch, M., 28, 6r, 62 

 Haviland, M., 245 



