INDEX. 



Abbott, C, on the battles of seals, 571. 



Abductor of the fifth metatarsal, presence of, in man, 47. 



Abercrombie, Dr. , on disease of the brain affecting speech, 100. 



Abipones, marriage customs of the, 683. 



Abortion, prevalence of the practice of, 52. 



Abou-Simbel, caves of, 191. 



Ahramis brama, 282. 



Abstraction, power of, in animals, 93. 



Acalles, stridulation of, 346. 



Acanthodactylus capensis, sexual differences of color in, 405. 



Accentor modularis, 539. 



Acclimatization, difference of, in different races of men, 191, 



Achetidae, stridulation of the, 320, 321, 323; rudimentary stridulat- 

 ing organs in female, 326. 



Acilius snleatus, elytra of the female, 313. 



Acomus, development of spurs in the female of, 512. 



Acridiidae, stridulation of the, 320, 324; rudimentary stridulating 

 organs in female, 326. 



Acromio-basilar muscle, and quadrupetal gait, 47. 



Acting, 203. 



Actinm, bright colors of, 294. 



Adams, Mr., migration of birds, 122; intelligence of nut-hatch, 

 466; on the Borribycilla carolinensis, 525. 



Admiral butterfly, 353. 



Adoption of the young of other animals by female monkeys, 79. 



Advancement in the organic scale. Von Baer's definition of, 186. 



Aeby, on the difference between the skulls of man and the 

 quadrumana, 170. 



-^Jsthetic faculty, not highly developed in savages, 105. 



Affection, maternal, 79; manife.station of, by animals, 79; parental 

 and filial, partly the result of natural selection, 120; mutual, of 

 birds, 467; shown by birds in confinement, for certain persons, 467. 



Africa, probably the birthplace of man, 177; South, crossed popu- 

 lation of, 198. South, retention of color by the Dutch in, 219; Soutli, 

 proportion of the sexes in the butterflies of, 283; tattooing practiced 

 in, 654; Northern, coiffure of natives of, 655. 



Agassiz L., on conscience in dogs, 117; on the coincidence of the 

 races of man with zoological provinces, 193; on the number of 

 species of man, 198; on the courtship of the land snails, 297; on the 

 brightness of the colors of male fishes during the breeding-sea.son, 

 385; on the frontal protuberance of the males of OeophagiiH and 

 Ciclda, 385, 392; male fishes hatching ova in their mouths, 391; 



