324 



INDEX 



Snail, experiments and investiga- 

 tions on educability of, 55- 

 61. 



Sooty terns, homing experiments 

 on, 1-6. 



Sounds, country, generally restful 

 and subdued, 103, 105. 



Spencer, Herbert, runs away from 



home at thirteen, 192. 

 his conviction that a right answer 

 must be given to the question 

 whether acquired characters are 

 or are not inherited, 221. 



Spring, biology of, 151. 

 its coming, on the moor of 

 Dinnet, 150. 



Squirrels, their storing instincts, 

 1 88. 



Starfishes, shedding a limb, 166, 



167, 169. 



Stevenson, R. L., quoted, 113. 

 Storing instinct, 183-190. 



among birds, 187. 



among insects, 184-187. 



among mammals, 188-189. 



in man, 189-190. 

 Story as to " young seals " being 



" so like birds," 9. 

 Stout, Professor, quoted, on smell, 



101. 

 Sweet Vernal grass, 95. 



Tadpoles, Gudernatsch's experi- 

 ments on, 147. 

 their power of regrowing parts, 



1 68. 



See also Frog. 



Tapeworms, 198, 200. 



Technique of the experiments on 

 homing of sea-swallows, 2. 



Technitella, 280, 282, 284, 286. 



Thompson, Miss Elizabeth Lock- 

 wood, her experiments on 

 snails, 56-61. 



Tower, Professor, his experiments 

 on potato-beetles, 241. 



Tregarthen, J. C., his observations 



on the otter, 120-126. 

 Troglodytes, 246-247. 

 Trypanosomes, 198, 202. 

 Tschermak, 232. 

 Twins, biology of, 158-165. 



Gallon's investigations on, 162- 

 164. 



Siamese, 159. 



similarity between, 162-164. 



Van Hoff's law of the effect of 

 temperature on chemical re- 

 actions, 129. 



Verhoeff, on wasp-community, 30. 



Vigor, acquired, does it count? 

 263-269. 



Vigor and Heredity, Mr. J. Lewis 

 Bonhote's book, 264-265. 



Wasp, solitary, its perfection of 



nest, 207-208. 



Wasps, African, 26, 28-31. 

 social life of, 24-31. 

 their family coherence, strength, 



and ingenuity, 25-26 

 their instinctive behavior, 270, 



271. 

 their wonderful workmanship of 



their nest, 24-25, 115. 

 Watson, Professor J. B., his experi- 

 ments on homing of sea- 

 swallows, 1-8. 

 his observations on the duration 



of the nesting impulse, 7. 

 Weismann, Professor, 155, 223, 



229, 230, 255. 



Werber, his physiological theory, 16 1. 

 Whales, Baleen, 72, 73. 



Black North Atlantic or Biscay, 



7i, 75- 



Black Right, 78. 

 Finback, 71. 



Greenland, or Bowhead, 78. 

 Humpback, 71. 

 Right, the fitness of, 71-79. 

 Whales, Sperm, 71. 



