INDEX 



481 



(illus.), 180, 204; flying (illus.), 

 335; migrations of, 340. 



Fish louse (illus.), 359. 



Fission, reproduction by, 213; (il- 

 lus.), 214. 



Fittest, survival of, 62. 



Flat worm, regeneration of (illus.), 

 285; (illus.), 286. 



Flounder, development of (illus.), 

 240. 



Flower bug, variation in pattern of 

 (illus.), 135. 



Flowers, varieties originated by 

 Burbank, 98. 



Focke, 192. 



Fol, H., theory of protoplasmic 

 structure, 250. 



Foot, of horse, evolution of (illus.), 

 177; of human embryo (illus.), 

 460; of mammals, hology of 

 digits of (illus.), 178. 



Forel, A., 394. 



Fossils, 17, 290. 



Fowls, skulls of (illus.), 88. 



Friedenthal, 460. 



Frog, male carrying eggs on back 

 (illus.), 73. 



Galls (illus.), 341; (illus.), 342. 



Galton, F., 165. 



Gasterosteus, 207; cataphractus (il- 

 lus.), 209. 



Gastrula, 228. 



Gaudry, A., 298. 



Gauss, 141. 



Geddes, P., 1. 



Gelasimus sp. (illus.), 38. 



Genealogy of animals, 36. 



Generation, 211; spontaneous, 42, 

 212. 



Geography, relation of species to, 

 311. 



Geology, table of ages of, 298. 



Georgine, variation in inflorescence 

 of (illus.), 161. 



Geranium, improvement in (illus.), 

 103. 



Germ cells, theory of the purity of, 



191. 



Gilbert, C. H., 303. 

 Gill slits of vertebrates, 179. 

 Goethe, W. von, 1, 48, 163, 289. 

 Gongylus gongyloides (illus.), 415. 

 Gonium pectorale (illus.), 34; (illus.), 



261. 

 Gorilla (illus.), 456; face of (illus.), 



457; head of (illus.), 457; young 



(illus.), 458. 

 Gray, A., 197, 326. 

 Gregarina polymorpha (illus.), 216. 

 Gregarinidae, reproduction in (illus.), 



216. 



Gregariousness, 380. 

 Grus americana (illus.), 20. 

 Grosbeak, cardinal, diagram of 



variation in, 136. 



Gryllotalpa (illus.), 344; (illus.), 345. 

 Gulick, J. T., 123. 



Haase, E., 423. 



Haeckel, E., 32, 197, 289, 457, 463, 



464, 466, 467. 

 Hair covering of human embryo 



(illus.), 174; covering of Russian 



dog-man (illus.), 174. 

 Hawaii, classification and distribu- 

 tion of Drepanidae of, 124; 



distribution of land snails of, 



123. 



Henneguy, L., 260. 

 Henslow, G., 124. 

 Heredity, 53, 163; defined, 163; 



laws of, 184; Mendel's law of, 



187. 



Herlitzka, 279. 

 Hermaphroditism, 223. 

 Heron, flying (illus.), 24. 

 Hertwig, O., 278. 

 Heterogenesis, 54; theories of. 114; 



theory of, 156. 

 Hippodamia convergens, aberrations 



of, 130; variation in pattern of 



(illus.), 132; (illus.), 133. 

 Hog, wild and domestic (illus.), 89. 



