334 INDEX 
Variation, meristic, 130 
similar and simultane- 
ous, 132 
substantive, 131 
Wading birds, 38 
Wallace, A. R., 16, 35, 43, 65, 
88, 157 
Webb, Sidney, 293 
Weismann, 16, 51, 65, 72 et 
Seq., 157, 278 et seq. 
Wells, 42 ‘ 
Werner, 25 
Whale, 52 
Wheat, 233 et seq. 
Wilks, 140 
Wilson, 74, 270 et seq. 
X-generation, 304 
Yucca plant, 54 
Yule, G. U., 227 et seq. 
Zygote, 185, 245 
BILLING AND SONS, LTD., PRINTERS, GUILDFORD 
