INDEX. 



Abbot, C, on the battles of seals, 

 496. 



Abductor of the fifth metatarsal, 

 presence of, in man, 40. 



Abercrombie, Dr., on disease of 

 the brain affecting speech, 86. 



Abipones, marriage customs of 

 the, 592. 



Abou-Simbel, caves of, 164. 



Abortion, prevalence of the prac- 

 tice of, 45. 



Abstraction, power of, in ani- 

 mals, 80. 



Acalles, striduletion of, 303. 



Acanthodactylus capensis, sex- 

 ual differences of color in, 353. 



Accentor modularls, 467. 



Acclimatization, difference of, in 

 different races of men, 16.3. 



Aohetidse, stridulation of the, 

 280, 283; rudimentary stridulat- 

 ing organs in female, 285. 



Acilius sulcatus, elytra of the 

 female, 273. 



Acomus, development of spurs m 

 the female of, 444. 



Acridiidae, stridulation of the, 

 280, 283; rudimentary stridulat- 

 ing organs in female, 285. 



Acromlo-basilar muscle, and 

 quadrupedal gait, 40. 



Acting, 174. 



Actiniae, bright colors of, 257. 



Adams, Mr., migration of birds, 

 105; intelligence of nut-hatch, 

 405; on the BombyclUa carolm- 

 ensis, 455. 



Admiral butterfly, 309. 



Adoption of the young of other 

 animals by female monkeys, 68. 



Advancement in the organic 

 scale. Von Baer's definition of, 

 159. ^ , 



JEby on the difference between 

 the skulls of man and the 

 quadrumana, 145. , , . , , 



.^slhetlc faculty, not highly de- 

 veloped in savages, 90. 



Affection, maternal, 68; manifes- 

 tation of, by animals, 68; par- 

 ental and filial, partly the re- 

 sult of natural selection, 102; 

 mutual, of birds, 405; shown by 



birds in confinement, for cer- 

 tain persons, 406. 



Africa, probably the birthplace 

 of man, 151; South crossed 

 population of, 170; South, re- 

 tention of color by the Dutch 

 in, 188; South, proportion of the 

 sexes in the butterflies of, 246; 

 tattooing practiced in, 669; 

 Northern, coiffure of natives 

 of, 569. 



Agassiz, L., on conscience in 

 dogs, 100; on the coincidence of 

 the races of man with zoologi- 

 cal provinces, 165; on the num- 

 ber of species of man, 170; on 

 the courtship of the land- 

 snails, 259; on the brightness of 

 the colors of male flshes during 

 the breeding season, 336; on 

 the frontal protuberance of the 

 males of Geophagus and Cich- 

 la, 336, 341; male fishes hatching 

 ova in their mouths, 342: sexual 

 differences in color of chro- 

 mids, 342; on the slight sexual 

 differences of the South Ameri- 

 cans, 556; on the tattooing of 

 the Amazonian Indians, 571. 



Age, in relation to the transmis- 

 sion of characters in birds, 458; 

 variation in accordance with, 

 in birds, 478. 



Agelffius phoenlceus, 220, 410. 



Ageronia feronia, noise produced 

 by, 304. 



Agrion, dimorphism in, 288. 



Ramburii, sexes of, 288. 



Agrionidse, difference in the sex- 

 es of, 288. 



Agrotis exclamatlonis, 313. 



Ague, tertian, dog, suffering 

 from, 8. 



Aithurus polytmus, young of, 

 483. 



Ainos, hairiness of the, 555. 



Albino birds, 413. 



Alca torda, young of, 481. 



Alces palmata, 511. 



Alder and Hancock, MM., on the 

 nudi-branch moUusca, 261. 



Allen, J. A., vigor of birds ear- 

 liest hatched, 208, 209; effect of 

 difference of temperature, 

 light, &c., on birds, 220; colors 



615 



