282 



INDEX 



Spurious allelomorphism, 253 

 Starch-grains of — 



round and of wTinkled peas, 128 

 round x wrinkled peas, 134 

 Sturges, the Rev., 39 

 Susceptibility to " rust," 138 

 Symbols for t5rpes of individual in 

 Mendelian heredity, 176 



Tortoiseshell colour in cats, 249 



Unfixable characters, their signifi- 

 cance, 39 



" Unisexual " crosses of De Vries, 

 139 



Unit characters, 216 

 Uvea, 43 



Variation — 

 continuous, 4 

 discontinuous, 4 

 Varietal characters, Mendelian in- 

 heritance of, 10 

 Varieties, Prof, de Vries' definition 

 of, 9 



Weininger, Otto, his theory of sex, 



258 

 Weismann, 187 



Zygote, 176 



Printed by Cassell & Company, Limited, La Belle Sauvage, London, E.C. 



10.11.11 



