INDEX 
P 
Palzozoic era, 170. 
Paley’s Natural Theology, 87. 
Pangenesis, 236. 
Patagonia and its terraces, 29. 
Phenacodus, 185. 
Physical evolution of man, 254. 
Pithecanthropus, 188. 
Planetesimal theory, 155. 
Playing dead, 107. 
Playing ’possum, 107. 
Polygamy in animals, 137. 
Pond-snail, development of, 46. 
Potato worm, 142. 
Protective coloration, 109. 
Protoplasm, 164. 
Pterodactyl, 180. 
Puff adder, 107. 
Purpose and: adaptation, 89. 
Purpose in nature, 88. 
Q 
Quiet and escape, 105. 
R 
Raining toads, 113. 
Religion and evolution, 74. 
Reptiles of Mesozoic, 179. 
Reproduction, asexual and sex- 
ual, 194. 
in fishes, 196. 
in frogs, 199. 
in reptiles, 202. 
Rhinoceros horn, 123. 
Romanes and isolation, 242. 
Rooster finer than hen, 132. 
297 
Ss 
Saint Augustine and evolution, 
II. 
Salamanders, 176. 
Sargent’s picture, 2809. 
Science and the book, 274. 
Science and theology, 280. 
Science, definition, 280. 
Seals and polygamy, 139. 
Sealskin and fur, 100. 
Sedgwick and Darwin, 24. 
Selection and evolution, 56. 
Sexual selection, 126, 128. 
Skunk’s odor, 117. 
Sloth and megatherium, 29. 
Song and mating, 133. 
Sparrow, English, adapted to 
town, 66. 
and hawks, 60. 
and winter, 73. 
eat varied food, 71. 
eye-minded, 78. 
feed young on insects, 72. 
good qualities, 85. 
has reached limit, 85. 
in Philadelphia, 63. 
introduction, 62. 
lives near houses, 70. 
nests early, 81. 
nests often, 82. 
Once migratory, 80. 
quarrels without animosity, 75. 
sociable, 74. 
spread of, 65. 
stays over winter, 79. 
successful, 83. 
transported in cars, 67. 
unafraid of man, 69. 
wintering, 73. 
