INDEX 



453 



trilobites, 289, Fig. 134. 



Trimen, E., 346. 



Triticwn saticum, Lamarck on, 378. 



Tritylodon, 301, 302. 



tuatara (se p . Hphenodon punctatas}. 



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. 

 Typhlopida?, 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. 

 Urccotypltlus africanus, Fig. 106. 

 urea, 9. 

 I *rsus 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. 

 Ynrunus, shoulder girdle, 234, Fig. 



89. 



variation, 148160. 

 ,, cause of, 166. 



curve of, 150, 153, Figs. 72, 



., 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, 157 160. 

 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. 

 Vespd crabro, Fig. 175. 

 vessels, of plants, 65. 

 vestigial organs, 257262, 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. 

 \ r orticeJ/<i, 40, Fig. 9. 



WAISTS, slender, 156. 



Walker, C. E., 175. 



Wallace, A. 11., views of, 319, 329 



389391, 393, 394. 

 warm-blooded animals, 6. 

 warning colours, 342 - 3-ls. 



,, ,, and natural selec 



tion, 396. 



wasps, coloui-s, 342. 

 waste products, 8, 9. 



