298 



INDEX 



Sparrow, House, 62. 

 Sphex wasp, 143. 

 Spider cocoons, 139. 

 Spider, young, 140. 

 Spontaneous generation, 159. 

 Stone lilies, 171. 

 Story of the horse, 220. 

 Struggle against enemies, 104. 



for food, 91. 



for shelter, 92. 



for the individual, 90. 



for the species, 91, 125. 

 Sunfish and young, 196. 



Taste of toad, 118. 

 Teeth of mammals, 98. 

 Temperature of mammals, 99. 

 Tertiary era, 185. 

 Thayer, concealing color, 115. 

 Theology and science, 280. 

 Theology, definition, 280. 

 Thomas Aquinas and evolution, 



12. 



Three-toed horse, 227. 

 Toad, bad taste, 118. 



color, 112. 



enemies, 113. 



short tadpole stage, 112. 

 Tomato worm, 142. 

 Turtles and young, 202. 

 Tusks of elephant, 124. 

 Tussock worm, 64. 



Two methods of reproduction, 



194- 

 Types of insect mouth, 93. 



Understanding the Bible, 281. 

 Underwing moth, 130. 



Variation and natural selection, 



49. 



by crossing, 53. 

 Virchow and man's ancestry, 



187. 

 Vireo's color, 115. 



W 



Wagner and isolation, 241. 

 Wallace and evolution, 39. 

 Warm-blooded animals, 99. 

 Weissman and evolution, 235. 

 Wilberforce, Bishop, and evolu- 

 tion, 41. 



Wintering of ground hog, 103. 

 Wintering of mammals, 103. 

 Wintering of squirrels, 103. 

 Woodchuck, 103. 

 Woodpecker's nest, 146. 



Young growing finer, 272. 



