INDEX 



Riddle, Oscar, 211 

 Robinson, Arthur, 83 

 Rock, John, 67 

 Runner, M. N., 258 

 Ruschig, H., 115 

 Ruzicka, L., 233 



Safe period, 149 



Saiki, Seiichi, 176 



Scheinfeld, A. M., 22 



Schickele, G., 81 



Schiller, Sara, 268 



Schlegel, J. V., 266 



Schroeder, R., 154, 166 



Schweitzer, Malvina, 22 



Scrotum, 218, 222, 223 



Scytomonas, mating, 13 



Sea urchin, reproduction, 16, 17, 

 18-22 



Seeger-Jones, G., 268 



Seminal duct, 225, 231 



Seminal fluid, 224, 226 



Seminal vesicle, 225 



Seminiferous tubules, 218, 235, 236 



Sex, bisexuality, 11, 15; nature of, 

 10, 11; in human beings, 26 



Sex characteristics, secondary, fe- 

 male, 96, 255; male, 227, 228, 255 



Sex skin, 190, 193 



Sex organs, embryonic, effect of 

 hormones on, 254-260 



Sex urge, in animals and man, 28, 

 70; effect of estrogenic hormones 

 on, 97, 98; relation of progester- 

 one to, 98; effect of androgenic 

 hormones, 237 



Shapiro, H., 20 



Shelesnyak, M. C, 164, 165 



Shnrr, kphraim, 74, 158 



Shrew, see Elephant shrew 



Simonnet, H., 143 



Slotta, K., 104, 115 



Smith, G. Van S., 172, 267, 268 



Smith, Olive W., 172, 267, 268 



Smith, P. E., 141, 164, 166, 171, 186, 

 222 



Snyder, F. F., 46 



Sobotka, Harry, 243 



Sow, eggs, 38, 39; events of cycle 

 in, 65-67 



Spermatogenesis, 221, 222, 235, 236 



Sperm cell, in fertilization, 17; of 

 Hydra, 10; in general, 15; of rat, 

 220; of man, 220; of sea urchin, 

 17; transmission to fem.ale, 23, 

 24; transportation within male, 

 224 



Spermine, 230 



Spiral arteries, see Blood vessels 



Sponges, reproduction by budding, 

 7, 22 



Stallion, excretion of estrogenic 

 hormone by, 85 



Steinach, E., 231, 235 



Steroids, Sterols, 86, 87, 116, 246 



Stewart, C. P., 129 



Stieve, H., 200, 204 



Stigmasterol, 253 



Stilbestrol (diethyl stilbestrol), 86, 

 89, 91 



Stockard, C. R., 22, 72, 82, 156 



Stover, R. F., 185 



Streeter, G. L., 57 



Strieker, P., 210, 212 



Taylor, Hugh, 89 



Te Linde, R. W., 268 



Testis, descent, 222, 223; double 

 function, 217; grafts of, 231, 235; 

 hormone (see also Androgenic 

 hormones), 228-240; of Hydra, 

 10; interstitial cells, 224, 231, 

 235; effect of pituitary hormones 

 on, 221, 222; structure, 218-220; 

 temperature, 222, 223 



Testosterone, 234, 251 



Tests, Allen-Doisy, 83; Aschheim- 

 Zondek, 202; capon (comb) 236; 

 Friedman, 202; rabbit test for 

 progesterone, 112, 232; vaginal 

 test, 83 



Thayer, S. A., 88 



Theca interna, 34 



Theelin, see Estrone 



Thyroid gland, 28 



Tice, P, S., opposite pp. 8, 9 



Toxopneustes, see Sea urchin 



Transportation of ovum and sperm 

 cell; see Ovum, Sperm cell 



Triplets, 43 



{ 280 } 



