2O4 



INDEX 



arbutus, 7 ; in Trillium, PI. 2 ; mutation, 



18 ; unequal in different species, 9. 

 Varieties, of domestic animals and plants, 



29 ; of horses, 28, /'/. 4 : swamped by 



intercrossing, 41. 

 Vermiform appendix, man and orang, 1 66, 



PI. gb. 



Wasps, color sense, 161 ; enemies of spiders, 

 121 ; fertilising orchid, 157, Pi. Sg ; 

 mimicked by other insects, 136, PL 70, 

 /'/. 7J>; protected by stings, 130, 135; 

 warning color, 130, PL 73, /'/. 77. 



Waved-yellow moth, 1 23, PL 63. 



Weasel,'/'/. 67. 



" Vertebrate Embryology "(Marshall), PI. 42. Weismann, August, acquired characters, 67 ; 



Vertebrates, development of, 97, 9$, PL 38, 

 PL gS ; varying degrees of complexity, 



97- 

 l'es/>a, breeding habits, 77 ; ocfii/entti/is, 



PL 74. 

 Vestigial structures, 93-96 ; in man, 164, 



PL 93-97. 

 Vigor, correlated with secondary sexual 



characters, 58. 

 Vilmorin, PI. 87. 

 Vinson, PL 64. 



I'/i'la iiicitllata, SS ; rostra/a, Sg. 

 Violaceir, 90. 

 Voice, in birds, 49. 

 I'oliicclla fin- id /is, PL 74. 

 Vries, de, Hugo, 18, 19, 39. 



Walking stick, 122, PL 61. 



Wallace, A. R., 35, 47, 50, 58, 132, 144, 189, 



191, PL 73. 



Wallihan, A. G., PL Si. 

 Warning coloration, 129-134 ; convergence, 



134. 

 Warren, E. R., 146, PL 53, PL 54, PL 57. 



germinal selection, 96; also, 122, 142, 



189, 191, PL 70, PI. 101. 

 Westermarck, 190. 

 Whale, hind limbs, 93, gj.. 

 Wheel, invention of, 176. 

 White Mountains, flora, 112. 

 " Wild Flowers of America " (Goodale), PI. 



88. 

 Wing, of bird and of butterfly, 92 ; fore 



limbs of vertebrates, g>. 

 Wolf, aggressive coloration, 126. 

 Woodcock, protective coloration, 49, 119, 



PL jo. 

 Wright, Lewis, 30, PL 16, PL 18. 



Xiphophorus hellerii, PL 32. 



Yellow-jacket, warning color, 130, 135 

 PL 74. 



Zcnzcra trsiit/i, PL 70. 

 Zittel, K., PL 44, PL 45. 

 Zygrena, PL j6, PL 70. 



