INDEX 
A 
Acquired characters not inher- 
ited, 52. 
Adaptation and purpose, 80. 
Adaptation for the individual, 
87. 
Adaptation for the species, 125. 
Advanced teaching, 291. 
Agassiz and evolution, 19. 
Age of the earth, 156. 
Allantois of chick, 206. 
American Museum of Natural 
History, 221. 
Anaxagoras and evolution, 9. 
Anaximander and evolution, 8. 
Ancestry of man, 186. 
Andes rising out of Pacific, 32. 
Aquinas, Thomas, and evolu- 
tion, 12. 
Archeopteryx, 181. 
Aristotle and evolution, 9. 
Armadillo and glyptodon, 29. 
Artificial flavors, 161. 
Artificial proteids, 161. 
Artificial sugars, 161. 
Ascent of man, 189. 
Asexual reproduction, 194. 
Augustine, Saint, and evolu- 
tion, II. 
Australian mammals, 186. 
B 
Bank swallow’s nest, 146. 
Barnacles studies by Darwin, 
34- 
Beagle and Darwin’s voyage, 
25. 
Beauty of human female, 127. 
Biologists accept evolution, 278. 
Bird colors, 131. 
Bird from reptile, 122. 
Bird nests, 145. 
Birds of a region definite, 61. 
Bird song, 135. 
Blowing viper, 107. 
Blue birds and frost, 61. 
Bradbury, Dean, 43. 
Buffon and evolution, 15. 
Bumble bees, 125. 
Butterfly colors, 129. 
Butterfly’s mouth, 95. 
Cc 
Carboniferous age, 174. 
Carnivorous teeth, 124. 
Caterpillars on leaves, IIo. 
Cave man, 188. 
Cells live in water, 166. 
Cenozoic age, 185. 
Cicada killer, 143. 
Circular nest of bird, 147. 
City life in man, 256. 
Clothing of birds, ror. 
Coal plants, 174. 
Cold-blooded animals, gg. 
Color, concealing, Thayer, 115. 
Concealing appearance, 105. 
293 
