320 
“ Fluctuations’ and 
238-240. 
Foraminifera or chalk-forming ani- 
mals, 278-281, 284. 
Forel, Auguste, his observations on 
ants, 18, 20, 22. 
Formica sanguinea, 
17. 
Foster, Sir Michael, quoted, on the 
living body, 104. 
Frankincense and myrrh, 95-102. 
Fremiet, M. Fauré, on the egg, 
136. 
Frog, life-cycle of, 47-54. 
Frogs’ eggs, artificial 
genesis of, 140. 
“ mutations,” 
blood-red ant, 
partheno- 
Gadow, Dr., quoted, on the frog, 47. 
Gain, Dr. Louis, on penguins re- 
turning to same rookeries to 
breed, 11. 
Galton, 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. 
INDEX 
Groos, Dr., 149. 
Gudernatsch, his experiments on 
tadpoles, 147. 
Hedge-sparrow shadowing and at- 
tacking cuckoo, 4o. 
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 or 
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, 1. 
Hookham, George, 226, 259 note, 
Hose, Dr. Charles, 290. 
House-that-Jack-built nutritive chain 
of sequences, 87, 91-92. 
Huber, Pierre, Swiss entomologist, 
18, 22. 
Huxley, quoted, on 
103-104. 
on oysters, 64. 
on the cycle of life, 142. 
on the sufferings of mankind, 295. 
Hyper-sensitiveness to sounds, 103, 
107. 
organisms, 
Inflammation, 304. 
Instinct, different from intelligence, 
210-211, 
