ABBOTT. 
ALCA. 
Abbott, C., on the bottles of seals, ii. 
240. 
Abductor of the fifth metatarsal, 
presence of, in man, i. 128. 
Abercrombie, Dr., on disease of the 
brain affecting speech, i. 58. 
Abipones, marriage-customs of the, 
ii. 373. 
Abou-Simbkl, caves of, i. 217. 
Abortion, prevalence of the practice 
of, i. 134. 
Abstraction, i. G2. 
Acalles, stridulation of, i. 384. 
Acanthodaci.i/lus capcnsis , sexual dif- 
ferences of colour in, ii. 36, 
Accentor modularis, ii. 198. 
Acclimatisation, difference of, in dif- 
ferent races of men, i. 216. 
Achetidx, stridulation of the, i. 352, 
353, 355 ; rudimentary stridnlating 
organs in female, i. 359. 
Acilius rule, this, elytra of the female, 
i. 343. 
-4com?fs, development of spurs in tlie 
female of ii. 162. 
AuHdiidx, stridulation of the, i. 352, 
356; rudimentary stridnlating or- 
gans in female, i. 309. 
Acting, i. 232. 
Admix, bright colours of. i. 322. 
Admiral butterfly, i. 392. 
Adoption ot the young of other ani- 
mals by female monkeys, i. 41. 
Advancement in the organic scale, 
Von Baer’s definition of, i. 211. 
Aeiiv, on the difference between the 
skulls of man and the quatlrumaua 
i. 190. 
^Esthetic facility, not highly deve- 
loped in savages, i. 64. 
Affection, maternal, i. 40 ; mani- 
festation of, by animals, i, 40 ; pa- 
rental and filial, partly the result 
of natural selection, i. 81 ; shown 
by birds in confinement, for certain 
persons, ii. 110; mutual, of birds, 
ii. 108. 
Africa, probably the birthplace of 
man, i. 199 ; South, crossed popu- 
lation of, i. 225; South, retention 
of colour by the Dutch in, i. 242 
South, proportion of the sexes i® 
the butterflies of, i. 310; tattooing 
practised in, ii. 339 ; 'Northern, 
coiffure of natives of, ii. 340. 
Agassiz, L, on conscience in dogs, >• 
78 ; on the coincidence of the rac® 9 
of man with zoological provinces, *• 
218; on the number of species 
man, i. 226; on the courtship oftb e 
land-snails, i. 324; on the bright' 
ness of the colours of male fish® 9 
during the breeding season, ii. 
on the frontal protuberance of th 0 
males of Geoj)hagu$ and CHchht, |] ‘ 
13, 20; on the slight sexual di# e * - 
ences of the South Americans, 
323 ; on the tattooing of the Au 111 " 
zonian Indians, ii. 342. 
Age, in relation to the transmissi° D 
of characters in birds, ii. 183; r;V> 
riation in accordance with, in birJ 5 ' 
ii. 213. 
Agdiuus phamiceus, ii. 116. 
Ageronia feronia , noise produced hji 
i. 387. 
Agrion , dimorphism in, i. 363. 
Agrion Mamburii , sexes of, i. 362. . 
AgriONIda*;, difference in the sexes 0 ’ 
i. 362. 
Agrotis exdamatioms, i. 369. 
Ague, tertian, dog suffering 
i. 13. 
AWiurus polytmus , young of, ii. 226* 
AlNOS, hairiness of the, ii. 321. 
Alca tor da , young of’ ii. 217. 
