234 



INDEX 



Physico-chemical basis of life, 

 10, 11 



Pieris octavia-seramus, 41 



Pigeon, passenger, 29 



Pigmentation, 40; in butterflies, 

 95, 180; in man, 94, 204 



Pike, F. H., 90 



Pituitary gland, 10 



Plants, and organic environ- 

 ment, 20; xerophytic, 134 



Plastids, 83 



Plebeius melissa, 119 



Poisons, response to, 56 



Polarity, 85 



Polled Hereford, 73 



Polyploidy, 74 



Powers, J. H., 26 



Prairie, 19 



Preadaptation, 125, 133, 159, 

 214 



Prescience, 185 



Pressure, 19 



Primates, 195 



Primordial living substance, 13 



Primrose, evening, 127 



Promorphology, 85 



Protophyta, 28 



Protozoa, 28; enucleate, 80; re- 

 sponses of, 185 



Pure lines, 27, 127 



Pyrgus centaur eae, 123 



Pyrgus tessellatay 42 



Rabaud, E., 5, 7 



Rabbits, 151, 155, 223 



Races, 42, 69; geographic, 152; 

 of deer-mice, 153 



Radiation, disintegrative, 48; 

 in evolution, 146, 151; ter- 

 restrial, 58 



Rays, 89, 212; see X-rays 



Reassortment, 68 



Recapitulation theory, 167 



Recombination, 57 



Relationship of nucleus and cy- 

 toplasm, 77 



Rensch, B., 152, 162 



Response, 56; adaptive, 64, 204; 

 of bumble-bees, 187; through 

 generations, 223; of higher 

 animals, 186; of honey-bees, 

 187; individual, 67, 155, 172; 

 of Protozoa, 185 



Resultants, 168, 169 



Reversibility, 218 



Rignano, E., 139 



River, analogy with species, 

 30 



Roux, W., 36, 116 



Ruthven, A. G., 161 



Salmo fario, 153 



Salmo ferox, 153 



Schroder, C, 222 



Schwarz, E., 162 



Scott, E. L., 90 



Scrophularia leporella, 43 



Scrotum, 91 



Seal, 218 



Secretin, 10 



Selection, 159, 194; coincident, 

 116; germinal, 115; and isola- 

 tion, 117; limitations of, 126; 

 and mutations, 130; natural, 

 70, 113, 227; organic, 116; re- 

 sults of, 118, 124; sexual, 70, 

 114 



Self-determination, 182, 195 



Semon, R. W., 139 



Sense organs, 90 



