INDEX 



299 



Shaw, G. B., 288 

 Sheep, Leicestershire, 130 

 Shirley poppies, 133 

 Snails, 200 

 Species, 5 



idea of, 6 



Jordan's, 9, 286 



Linnaean, 7 



Spencer, Herbert, 22, 43, 59 

 Spermatozoa, 228 

 Spindle, nuclear, 233 

 Spores, 240, 271 

 Standard deviation, 91 

 Statistics, 12, 74 



collection of, 79 

 Stature, 83, 99 

 Sterility, 286 

 Stocks, 200 

 Strawberries, 160 

 Strength of pull, 82 



of wheat flour, 217 

 Structural characters, in- 

 heritance of, 172 

 Substantive variation, 124 

 Sugar-beet industry, 128 

 Survival of the fittest, 43 

 Swamping effect of crossing, 



204 



Sweet-peas, 196 et seq. 

 Symmetry, 122 

 Syrphidae, 52 



Tactual discrimination, 60 

 Tetrads, 242 

 Thomson, J. J., 23, 120 

 Tinged white, 197 

 Treviranus, 29 

 Trifolium pratense, 143 

 Tschermak, 19, 179, 189 



Types, primary and sub- 

 ordinate, 1 1 8 



Unicellular animals, 223 

 Unit characters, 165, 203 

 Usher, Bishop, 26 



Variability, acquired, 283 

 correlated, 98 

 genetic, 283 

 Variate, 90 

 Variation, 14 



continuous, 14, 75, 280 



et seq. 

 discontinuous, 14, 121, 



276 et seq. 

 meristic, 123 

 similar and simultane- 

 ous, 125 

 substantive, 124 



Wading birds, 34 



Wallace, A. R., 16, 39, 59, 81, 



146 

 Weismann, 16, 46, 59, 66 et 



seq., 146, 259 et seq. 

 Wells, 38 

 Werner, 24 

 Whale, 47 

 Wheat, 215 et seq. 

 Wilks, 133 

 Wilson, 68, 253 et seq. 



X-generation, 270 



Yucca plant, 48 

 Yule, G. U., 209 etseq. 



Zygote, 174, 228 



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