522 
Primula kiwensis, 364; P. sinensis, 317, 
394, 445 
Priority, law of, 117 
Probable error, 368 
Procamelus, 74, 75 
Promise of Race Culture, 497-509 
Pronucleus: male, 301; female, 302 
Protective resemblance, 200, 201 
Protohippus, 72 
Protylopus, 74, 75 
Pterodactyl, wing of, 134 
Punnett, R. C., 385, 395, 396, 446 
Pure lines, heredity in, 376-79 
Purity of gametes, 386, 387 
Python, hind limbs of, 141, 142 
Quadrumana, 148 
Rabl, C., 166 
Race culture and human variety, 504, 
505 
Rana sylvatica, 333; R. palustris, 333 
Recapitulation, doctrine of, 60, 171, 
172; critique of, 173-82 
Reduction divisions, in maturation, 405 
Reighard, J., 203 
Remora, 199 
Reversion, 13 
Revival of Science, the, 15, 16 
Rhodeus amarus, 212 
Rignano, E., 335 
Robinson, L., 151, 152 
Rodentia, loss of teeth in, 180 
Romanes, G. J., 35, 101-10, 129-63, 263, 
264, 329 
Roosevelt, T., 217 
Rosanoff, A. J., 465 
Roux, W., 268 
Rumford, B. T., 277 
Ruminants, collar-bone of, 180 
Ruskin, J., 503, 504, 508 
Ruskin and race culture, 503, 504 
Rutherford, E., 275 
Sacculina, 171, 181, 198, 453 
Saleeby, C. W., 497-509 
Saltatory, variations, 38 
Sandwich Islands, fauna of, 109, 110 
Saunders, 393 
READINGS IN EVOLUTION, GENETICS, AND EUGENICS 
Scardafella inca, 316, 317; S. dialeucos, 
316, 317; S. braziliensis, 316, 317; 
S. ridgwayi, 316, 317 
Schoetensack, Dr., 89 
Schuchert, C., 67, 68, 69 
Scott, W. B., 5, 6, 62, 63, 73-6, 82, 123- 
28, 173-82 
Scrophularia, 319, 320 
Seals, comparative anatomy of, 129, 130 
Secondary sexual characters, 453, 454 
Sedum spectabile, 312-14 
Segregation, Mendel’s Law of, 40-42, 
382-85 
Semon, R., 335 
Serology, evidences from, 60 
Sex determination, 449-56; chromo- 
some mechanism of, in Drosophila, 
41off.; in parthenogenetic species, 
451, 452; nutrition theory of, 449; 
at time of fertilization, 449, 450; 
various theories of, 449-51 
Sex differentiation, 453-56 
Sex, Heredity and, 44, 305, 306 
Sex-linked inheritance, 433, 440 
Sexual coloration, 204 
Sexual Selection, 26, 230-32 
Shelford, V. E., 190 
Shull, A. F., 73, 76-80, 100, 101, 117-20 
Shull, G. H., 43 
Signals and recognition marks, 203, 204 
Sims, G. R., 503 
Smith, E. A., 339 
Smith, G., 453 
Snow, E. C., 493 
Solidago virguarea, 324 
Species, definitions of, 121, 122 
Spencer, H., 4, 19, 28, 29, 264, 325, 508 
Spermatid, 298, 299 
Spermatocyte, 298, 299 
Spermatogenesis, 298, 299 
Spermatogonium, 298, 299 
Spermatozoén, 165, 298, 299 
Spontaneous generation, 12 
Sports, 38 
Sprengel, C. K., 210 
Standard deviation, 367, 368 
Staples-Brown, R., 397 
Statistical study: of variation, 365-70; 
of heredity, 370-75 
Stegodon, 76, 77, 78, 79 
