INDEX 



trilobites, 289, Fig. 134. 



Trimen, B., 346. 



Triticum sativum, Lamarck on, 378. 



Tritylodon, 301, 302. 



tuatara (set Sjihenodon punctatus). 



Tubularia, 121, Fig. til. 



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. 

 Typhlopidrc, 250. 



U 



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. 

 Ureeotyphlus africanus, Fig. 106. 

 urea, 9. 

 l r rsus arctos, systematic position, 229, 



Fig. 86. 

 use and disuse, effects of, 156, 166. 



Buff on on, 367 368. 



Charles Darwin on, 391, 392. 



Lamarck on, 377, 378, 379, 380, 

 382. 



E. Chambers on, 385. 

 uterus, 125. 



V 



VACCOLES, contractile, 39, 83. 

 Varanus, shoulder girdle, 234, Fig. 



89. 



variation, 148 160. 

 ,, 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. 

 Vertebrata, geological history, 289 



304. 



,, origin, 291. 



Vesper crabro, Fig. 175. 

 vessels, of plants, 65. 

 vestigial organs, 257 262, 271, 345, 



397. 

 ,, ,, Charles Darwin on, 



392. 



vibrations, in determinants, 189. 

 Virchow, 38. 

 vital force, 11, 143, 216. 

 vitalism, 19. 



vitelline membrane, 140. 

 volume, increase of, Lamarck on, 



382. 



,, relation to surface, 20. 

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

 Von Baer, 265. 

 Von Mohl, 38. 

 Vorticella, 40, Fig. 9. 



w. 



WAISTS, slender, 156. 



Walker, C. E., 175. 



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



389-391, 393, 394. 

 warm-blooded animals, 6. 

 warning colours, 342 348. 



,, ,, and natural selec 



tion, 396. 



wasps, colours, 342. 

 waste products, 8, 9. 



