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.

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