INDEX 



335 



Primula pyramidalis, 194 

 sinensis, 151, 194, 272 

 stellata, 194 



Probability, theory of, 91 

 Progressive mutation, 153 

 Pronuba, 54 

 Protective resemblance, 54 et 



seq. 



Protenor belfragi, 272 

 Prothallus, 308 

 Protogene, 229 

 Protoplasm, 239 

 Protozoa, 116 

 Protozygote, 229 

 Puccinia glumarum, 237 

 Punnett, Prof. R. C., 47, 192, 



200, 238 

 Pure lines, 116 et seq., 320 et 



seq. 



selection in, 119 

 Purple Invincible (sweet pea), 



210 



Quartile, 97 

 Quetelet, 80, 86, 93 



Rabbit, 214 

 Radium, 23 

 Raimannia, 156 

 Ranunculus, 7 



water, 150, 317 

 Recessive characters, 179 

 Red Fife (wheat), 235 

 Reducing division, 258 et seq. 

 Regeneration, 61 et seq. 

 Regression, 107 

 Resemblance, protective, 54 et 



seq. 



Retrogressive mutation, 154 

 Reversion on crossing, 202 ct 



seq., 213 



Rivet wheat, 234 

 Romanes, G. J., 41, 79 

 Rosenberg, 254 

 Rotifers, 47, 330 

 Routgh Chaff (wheat), 235 

 Rust immunity, 237 



Saunders, Miss, 209, 214 

 Saxifraga hypnoides, 59 



Schuster, E., 299 

 Sea-horse, 55 

 Sea-urchin, 256 

 Sedgwick, A., 75 

 Selection, artificial, 44, 114 et 

 seq., 135, 141 



natural, 42 et seq., 48 ct 

 seq., 76, 141, 157, 295 



sexual, 62 et seq. 

 Selective fertilization, 209, 274 

 Sex, 221, 272 et seq. 

 Shaw, G. B., 325 

 Sheep, Leicestershire, 137, 215 

 Shirley poppies, 140 

 Shull, Dr. G. H., 213 

 Snails, 215 

 Snakes, 37 



Somatic cells, 74, 272, 274 

 Species, idea of, 6 



Jordan's, 9, 153, 322 



Linnsean, 7 et seq. 



Origin of, 5, 124, 147 et 



seq., 323 

 Spencer, Herbert, 23, 40, 47, 65 



et seq., 71, 122 

 Spermatozoa, 245, 310 

 Spindle, nuclear, 250 

 Spores, 257, 307 

 Standard deviation, 98 

 Statistics, 12, 81 



collection of, 86 

 Stature, 90, 106 

 Sterility, 323 

 Stick insects, 55 

 Stocks, 214 

 Strawberries, 172 

 Strength of pull, 89 



of wheat flour, 235 

 Structural characters, inherit- 



ance of, 185 



Substantive variation, 131 

 Subtypes, 126, 127 

 Sugar-beet industry, 135 

 Superman, 326 

 Survival of the fittest, 47 



of useless structures, 157 

 Swamping effect of crossing, 



221 

 Sweet peas, 209 et seq. 



