. Biology . ypsin, digestive ferment, 40Tschermak, genetics, 219Typhlosole, 141 U Urea, food for bacteria, 37; disposalin Amoeba, 50; product of me-tabolism, II Uroglena Americana, colony of pro-tozoa, 58 Use and disuse of organs, 234 V Ventral and dorsal differentiation,18 Verworn, definition of irritability,52; experiments with Amoeba, 49 Vestigial organs, 234 Vitamines, 42 Voluntary and involuntary move-ments, 24 INDEX 255 w Weigert, hyper-regeneration, 201 Weismann, heredity, 208; matura-tion significance, 211; old age anddeath, 70 Wilson, E. B., 14, 27, 210, 212, 217;See Sedgwick. Winiwar
. Biology . ypsin, digestive ferment, 40Tschermak, genetics, 219Typhlosole, 141 U Urea, food for bacteria, 37; disposalin Amoeba, 50; product of me-tabolism, II Uroglena Americana, colony of pro-tozoa, 58 Use and disuse of organs, 234 V Ventral and dorsal differentiation,18 Verworn, definition of irritability,52; experiments with Amoeba, 49 Vestigial organs, 234 Vitamines, 42 Voluntary and involuntary move-ments, 24 INDEX 255 w Weigert, hyper-regeneration, 201 Weismann, heredity, 208; matura-tion significance, 211; old age anddeath, 70 Wilson, E. B., 14, 27, 210, 212, 217;See Sedgwick. Winiwarter, sex chromosomes ofman, 228 Woodruff, so-called immortality ofParamecium, 71 Work done by plants for animals,128 Wright, opsonin, 197 Yeast, alcohol and acetic acid forma-tion, 38; culture media, 31; endo-enzymes, 39; fermentation, 37;reproduction, 30; spore formation,31; structure, 29 Zoogloea, jelly secretion by bacteria, 34 Zoology, subject matter, i Zymase, 39 Zymogen, basic substance of en-zymes, 37.
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