INDEX. 



471 



Vertebrata, late origin of repro- 

 ductive cells in, 74. 



Vespa, 54. 



Viola calcarata, fertilization of, 

 318 ; tricolor, 428. 



"Vitrinae, length of life of, 56. 



Volvocineae, 206, 253. 



Volvox, 208, 254. 



Vcrticellidae, conjugation of buds 

 of, 294. 



Vultures, length of life of, 11, 37. 



Wallace, on constancy of number 

 of individuals in successive gen- 

 erations, 13 ; on production of 

 death by natural selection, 23. 



Wasps, duration of life of male and 

 female, 19, 54 ; loss of embryonic 

 limbs in development of larva of, 



Westphal, on epilepsy in guinea- 

 pigs, 323. 



W^hales. length of life of, 6 ; adap- 

 tation in, 268 



White mice, experiments in the 

 transmission of mutilations on, 

 444. 



Will, on origin of ova, 226. 



Wolff, on theory of epigenesis,325. 



Zacharias, on the inheritance of 

 mutilations, 438. 



THE END. 



