Tapir, 41; Moeritherium, 97. Thorndike, 209; heredity of mental qualities, 232. Tidal waves, 85. Tigers, 101. Tirawa, 301. Tissue-cells, 28. Torga, 183. Tortoise, soft shelled, of the Mississippi, 45. Tower, 148. Transformation, natural, 170. Tribes, 32. Tuberculosis, bacillus of, 127. Turtles, evolution of, 45. Ungulates, 65. Uniformitarianism, Lyell's doctrine, 80. Urea, 29. Ussher, Archbishop, 178. Variation, 110; causes of, 111; among individuals, 112, 113; fact of difference, phenomenon of, 114; 115, 118, 119, 121, 129; congenital, 138; human, 174; racial, 177; laws of, in mental phenomena, 203; 232. Vertebrata, 43. Vertebrates, backboned animals, fishes the lowest order of, 46; principles of relationship, families, tribes, 47; 53-59; great classes originate together, 64; more complicated, 68; skeleton remains of, succeed invertebrates, 92; testimony of the rocks, 93; largest, 94; appearance of great classes of, 94; 95; classes that make up, 156; lower, arrangement of organs, 201; nervous system of, 256, 257. Volcanoes, 88. Volvox, 252, 254, 259, 265. Von Baer, law of recapitulation, 71. Vorticella, 251, 252, 265. Wagner, 100. Wallace, Alfred Russel, 117, 100. Walruses, 38. Wasps, ground, 207; organizations, of digger, 260; 261. Weismann, 71, 72; proved nuclei of egg contains, essential factors, 71, 145, 148. Weisner, 143. Whales, 40. Wilson, 146. Woehler, 29. Wolf, Tasmanian, a true marsupial, 42. Wolff, 70. Wolves, 140. Wombat, 42. Wood-frog, 71. Woods, heredity of mental qualities, 232. Worms, blindworm of England, 45; 48, 50, 53, 81; nervous mechanism of, 205, 206; nervous system of, 256, 257. Zebras, 96, 97, 112. Zooelogy, 34, 75, 78; geographical distribution, 100. "Zooenomia," 135. ~COLUMBIA UNIVERSITY PRESS~ Columbia University in the City of New York [Illustration] The Press was incorporated June 8, 1893, to promote the publication of the results of original research. It is a private corporation, related directly to Columbia University by the provisions that its Trustees shall be officers of the University and that the President of Columbia University shall be President of the Press. * * * * * The publications of the Columbia University Press include works on Biography, History, Economics, Education, Philosophy, Linguistics, and Literature, and the following series: