320 



INDEX 



" Fluctuations " and " mutations," 

 238-240. 



Foraminifera or chalk-forming ani- 

 mals, 278-281, 284. 



Forel, Auguste, his observations on 

 ants, 18, 20, 22. 



Formica sanguined, blood-red ant, 



17- 



Foster, Sir Michael, quoted, on the 

 living body, 104. 



Frankincense and myrrh, 95-102. 



Fremiet, M. Faure, on the egg, 

 136. 



Frog, life-cycle of, 47-54- 



Frogs' eggs, artificial partheno- 

 genesis of, 140. 



Gadow, Dr., quoted, on the frog, 47. 



Gain, Dr. Louis, on penguins re- 

 turning to same rookeries to 

 breed, 1 1. 



Gallon, Sir Francis, his insistence 

 on the reality of transilient 

 variations, 240. 

 his investigations on biology of 



twins, 162-164, 165. 

 his studies of inheritance, 230- 



231 

 referred to, 223. 



Gates, Dr. Ruggles, his investiga- 

 tions on mutation of CEnothera, 

 242-245. 



Geddes, Professor Patrick, his idea 

 as to life-curve, 143. 



Giard, Professor, 176. 



Gladstone, Hugh S., his observa- 

 tions and statistics on rooks, 38. 



Globerigina, 279. 



Goal, the unseen, the way in which 

 animals persistently work to- 

 wards, 270-277. 



Goethe, quoted, 276. 



Goldfishes, experiments on, 249. 



Gorilla, restless habits of, 195- 



Graham, Thomas, on " energia," 

 216. 



Groos, Dr., 149. 

 Gudernatsch, his 

 tadpoles, 147. 



experiments on 



Hedge-sparrow shadowing and at- 

 tacking cuckoo, 40. 



Heine, his definition of silence, 106. 



Hempelmann, Dr., quoted, on the 

 frog, 54. 



Henderson, Professor, on the ori- 

 gin of life on the earth, 214, 

 215, 216, 218. 



Henri, Mme., her experiments on 

 the bacillus of anthrax, 241. 



Herdman, Professor, quoted, on 

 Diatoms, 82, 87. 



Heredity. See Sequel to "The 

 Jukes." 



Heron-Allen, Edward, his observa- 

 tions on shells, 278-286. 



Herrick, Professor F. H., his sug- 

 gestion as to cuckoos' loss of 

 nesting instinct, 43. 



Hippocampus, 256. 



Holmes, Professor, quoted, on 

 evolution of the voice in verte- 

 brates, 49. 



Homing of birds, problem of, I. 



Hookham, George, 226, 239 note. 



Hose, Dr. Charles, 290. 



House-that-jack-built nutritive chain 

 of sequences, 87, 91-92. 



Huber, Pierre, Swiss entomologist, 

 1 8, 22. 



Huxley, quoted, on organisms, 



103-104. 

 on oysters, 64. 

 on the cycle of life, 142. 

 on the sufferings of mankind, 295. 



Hyper-sensitiveness to sounds, 103, 

 107. 



Inflammation, 304. 



Instinct, different from intelligence, 



210-21 1. 



