Temperature coefficient, 290 ff., 305; for enzyme, 291; for development, 292 ff.; for oxidations, 295; and fluctuating variation, 296 ff.; for heart-beat, 300 ff.; for duration of life, 366 Thatcher, Miss, 181 Thyroid inducing metamorphosis in tadpoles, 155, 156 Tichomiroff, 95 Tissue culture of spermatozoa, 127 Tissues, transplantation of, 30 ff., 44 ff.; cultivation of, 31 ff.; specificity of, 44 ff. Torrey, H. B., 264, 269 Tower, 348 Transfusion of blood, 53 Transplantation, of tissues, 30 ff., 44 ff.; of cancers, 45; of anlagen, 148; of eye of salamander, 157; of testes, 226; of ovaries, 227 Traube, 28 Treub, 21 Trial and error, 268, 270 _Trifolium arvense_, 37 Tropisms, 11 ff., 92 ff., 147, 178, 187, 253 ff.; and instincts, 253; theory of, 257 ff. Tropisms, in embryonic development, 147; of cave animals, 324 Trypanosomes, 332 ff. Trypsin, synthetic action of, 27 _Tuber brumale_, 60 _Tubularia crocea_, 171 _Tubularia mesembryanthemum_, 167, 169, 192 Twins, origin of, 136 ff.; sex of, 211 Tyndall, 33 _Typhlogobius_, 320 _Typhlomolge_, 320 _Typhlotriton_, 320, 323 Tyrosinase, 249, 250 Tyrosine, 249, 250 v. Uexküll, J., 4 ff., 128, 139 Uhlenhuth, E., 157, 183, 187 Uhlenhuth, P., 55, 58, 66, 322 Underhill, F. P., 23 _Vanessa, prorsa_, 303; _levana_, 303 Vaney, 217 Van Slyke, D. D., 22, 24, 291 van’t Hoff, 24 ff., 290, 292, 296 Variation, 6, 297 ff., 346-348 Vitzou, 159 _Volvox_, 280 Walcott, 42, 61 Warburg, O., 117 ff. Warming, 41 Wasps, polymorphism in, 222-224; sex determination, 255 ff. Wassermann, 55 Wasteneys, H., 29, 82, 87, 112, 113, 117, 191, 277, 293, 295, 335, 364 Weiggert, 188 Weismann, 7, 30, 303 Wells, H. G., 62, 69 Welsh, D. A., 60 Werner, F., 340 Wheeler, W. M., 43 White, J., 36 Whitney, D. D., 224 Wilson, E. B., 68, 143, 199 ff. Winkler, 47 Winogradsky, S., 16 ff., 42 Wolf, G., 182, 187 Yeast cells, cultivation of, 15 ff. Young, 16, 358 _A Selection from the Catalogue of_ G. P. PUTNAM’S SONS Complete Catalogues sent on application Putnam’s Science Series =1.=--=The Study of Man.= By Professor A. C. HADDON, M.A., D.Sc., M.R.I.A. Fully illustrated. 8^o. “A timely and useful volume.... The author wields a pleasing pen and knows how to make the subject attractive.... The work is calculated to spread among its readers an attraction to the science of anthropology. The author’s observations are exceedingly genuine and his descriptions are vivid.”--_London Athenæum._ =2.=--=The Groundwork of Science.= A Study of Epistemology. By ST. GEORGE MIVART, F.R.S. 8^o.