INDEX 



319 



young cuckoo's behavior in nest, 



44-46. 



Cyon's theory, that birds nose their 

 way home through the air, 6. 



Dakin, Dr. W. J., on the food of 



the Copepods, 81. 

 Darwin, Charles, going forward 



with, 225-228. 

 on brain of the ant, 134. 

 Darwin, Charles, on earthworms, 



184. 



on heredity, 229. 

 on kelp, 93. 



on two Roman snails, 55. 

 on water discolored by minute 



floating Algae, 82. 

 referred to, 206. 

 Darwinism, no recantation of, 224- 



225. 

 Davenport, Dr. C. B., his studies 



on " rovers," 191-196. 

 on " The Jukes," 295-296, 300- 



301. 

 De Vries, a rediscoverer of Men- 



delian clue, 232. 

 his study of mutations and their 



behavior, 240-241. 

 Dearborn, Professor, observations 



on his book on joy, 309-315. 

 Delage, Professor Yves, his method 

 of subjecting ova to chemical 

 action, 140. 

 Diatoms, 81, 82, 87. 

 Differences in degeneration of eyes 



of cave animals, 247-248. 

 Digger-wasps, 270, 271, 273. 

 Dinnet, the moor of, in spring, 150. 

 Disease, almost none in wild 



Nature, 302. 

 the organism's efforts to adjust 



itself to environment, 304. 

 the seamy side of variability, 307. 

 Doflein, 248. 



Duchatel's hypothesis as to sensi- 

 tiveness of retina of bird, 5. 



Dugdale, R. L., his studies on 

 " The Jukes," 294-295. 



Earland, Mr., his investigations on 



shells, 282, 283. 

 Earth, the, " preparations " that 



make it fit for a home for 



living creatures, 213-216, 217- 



220. 

 Earthworms, storing instinct in, 



184. 

 Ebrard, incident of the ants* 



cocoons reported by, 20. 

 Egg, the microcosm of the, 134- 



141. 

 Eigenmann, Professor, his study of 



cave-fishes, 250, 252. 

 Embryos, dwarf and Siamese-twin, 



141. 



Emery, Professor Carlo, his in- 

 vestigations on the European 



Amazon ant, 17-23. 

 Estabrook, Dr. Arthur H., his 



sequel to the story of " The 



Jukes," 295, 297-300. 

 Eumenes amedei, 207, 208. 

 Euphausia, penguins' food, 13. 

 Evening Primrose, mutations of, 



240, 241, 242. 



Evolution, convergence in, 254-262. 

 Evolution of the free hand, 288- 



293- 



Experiments on egg-cells, 140-141. 

 on homing of sea-swallows, 1-8. 

 with ants and bees, 7. 

 Ewart, on seeds, 179. 



Fabre, the late M. Henri, his ob- 

 servations on beetles, 185. 

 his observations on wonders of 

 instinct, 206-210. 



Fall of the year, 111-119. 



Fall of the leaves, 114-115. 



Fish embryos, experiments on, 250, 

 251. 



" Floating meadows," 81-82, 88. 



