INDEX 



453 



trilobites, 289, Fig. 134. 



Trimen, E., 346. 



Triticum sativum, Lamarck on, 378. 



Tritylodon, 301, 302. 



tuatara (see Splienodon pundatus). 



Tubularia, 121, Fig. 61. 



turbellarian, fertilization of polar 



body, 135. 



turbot, colour changes, 342. 

 turtles, dispersal, 323 



limbs, 236,244. 

 twins, identical, 173. 

 types, in wheat, 412. 

 Tyndall, 215. 

 Typhlopidee, 250. 



ULNA, 237. 



unconscious memory, 191, 192. 



ungulates, 301. 



limbs of, 239241. 

 unguligrade, 240. 

 unicellular, 38. 

 unisexual, 99, 105. 

 unit characters, 200, 206. 



origin of, 415, 416. 



unstriped muscle, 57, Fig. 21. 

 Uroeotyplilus africanus, Fig. 106. 

 urea, 9. 

 Ursus arctos, systematic position, 229, 



Fig. 86. 

 use and disuse, effects of, 156, 166. 



Buffon on, 367368. 



Charles Darwin on, 391, 392. 



Lamarck on, 377, 378, 379, 380, 

 382. 



E. Chambers on, 385. 

 uterus, 125. 



VACUOLES, contractile, 39, 83. 

 Varanus, shoulder girdle, 234, Fig. 



89. 



variation, 148160. 

 cause of, 166. 



curve of, 150, 153, Figs. 72, 



73. 

 in grape hyacinth, 150, 



Fig. 72. 

 ,, ,, human stature, 152, 



Fig. 73. 

 variations, blastogenic, 149, 157 



160. 



congenital, 157. 

 ,, continuous, 148, 150. 



variations, ""discontinuous, 149, 153 



156. 

 ,, fluctuating, 148, 150, 



155, Figs. 72, 73. 

 germinal, 149, 157160. 

 ,, individual, 150. 



inheritance, 403, 404. 

 meristic, 148, 149. 

 ,, normal, 150. 



origin, 153, 173, 403, 



404. 



selective value, 403, 404. 

 ,, somatogenic, 149, 156, 



157. 



substantive, 148, 150. 



vasa deferentia, 125. 

 vascular bundles, 65. 



system in plants, 50. 

 vegetable marrow, flowers, 111. 

 vegetative cell in pollen grain, 108. 

 Vergil, 214. 



vertebrae, meristic variation, 149. 

 vertebral column, development, 266. 

 VertebfataT-geol ogieaL Jnstory, 289 



304. 



" origin, 291. 

 Vespa crabro, Fig. 175. 

 vessels, of plants, 65. 

 vestigial organs, 257262, 271, 345, 



397. 

 ,, ,, Charles Darwin on, 



392. 



vibrations, in determinants, 189. 

 Yirchow, 38. 

 vital force, 11, 143, 216. 

 vitalism, 19. 



yitelline membrane, 140. 

 volume, increase of, Lamarck on, 



382. 



relation to surface, 20. 

 Yolvox, 42, 91, 97, 98, 265, Fig. 11. 

 Von Baer, 265. 

 Von Mohl, 38. 

 Vvrticella, 40, Fig. 9. 



W. 



WAISTS, slender, 156. 



Walker, C. E., 175. 



Wallace, A. E., views of, 319, 329, 



389391, 393, 394. 

 warm-blooded animals, 6. 

 warning colours, 342 348. 



,, ,, and natural select 



tion, 396. 



wasps, colours, 342. 

 waste products, 8. 9. 



