INDEX. 



455 



Valaoritis, on origin, of germ-cells, 



195 ; on physiological value of, 246. 

 Vanessa cardui, length of life of, 43 ; V. 



prorsa, 44 ; V. urticae, 44 ; V. levana, 



deposition of eggs of, 94. 

 Variations, always present, 101. 

 Ventral canal cell, 223. 

 Vertebrata, late origin of reproductive 



cells in, 74. 

 Vespa, 53. 

 Viola calcarata, fertilization of, 310; 



tricolor, 414. 



Vitrinae, length of life of, 55. 

 Volvocineae, 202, 248. 

 Volvox, 204, 248. 

 Vorticellidae, conjugation of buds of, 



287. 

 Vultures, length of life of, II, 37. 



Wallace, on constancy of number of 

 individuals in successive generations, 

 1 2 ; on production of death by natural 

 selection, 23. 



Wasps, duration of life of male and 

 female, 18, 53; loss of embryonic limbs 

 in development of larva of, 89. 



Westphal, on epilepsy in guinea-pigs, 



3i4- 



Whales, length of life of, 6 ; adaptation 

 in, 261. 



White mice, experiments in the trans- 

 mission of mutilations on, 431. 



Will, on origin of ova, 222. 



Wolff, on theory of epigenesis, 316. 



Zacharias, on the inheritance of mutila- 

 tions, 426. 



THE END. 



