IIlN-DEX. 



A. 



Abbott, C, on the battles of seals, U. 229. 



Abductor of the fifth metatarsal, presence 

 ot in man. i. 123. 



Abercrombie, Dr>, on disease of the brain 

 affecting speech, i. 56. 



Abiposes. ni.irriuge-customs of the, ii. 356. 



ABon-SiMBEL. caves of, i. 209. 



Abortion, prevalence of the practice ot, i. 

 129. 



Abstraction, i. 60. 



Acal/fK stridulation ot i. 372. 



Acantluxliivti/luit capetwfUi, sexual differ- 

 ences of color in, ii. 34. 



Accentor modnhirix. ii. 189. 



Acclimatization", difference ot, in differ- 

 ent races of men. i. 209. 



AcJietidtr. striilul:itiou of the, I. 341, 342, 

 84S ; rudimentary stridulating or^'ans in 

 female, i. 'A\-i. 



Aci/iu« gu/cattis, elj'tra of the female, i. 

 363. 



Acomus. development of spurs in the fe- 

 male of, ii. 154. 



Aoridiidw, stridulation of the, i. 342, 345; 

 rudimentary stridulating organs in fe- 

 male, i. 34S. 



AcTiNo, i. 224. 



Aciiiiicp, brijfht colors of i. 813. 



Ad-Miral butterfly, i. 3i0. 



Adoption of the "young of other animals 

 by female monkeys, i. 39. 



Advancement in the organic scale, Von 

 Baer's definition oC i. 203. 



Aeby, on the difference between the skulls 

 of man and the quadruiiiana. i. 1^3. 



^Esthetic faculty, not highly developed in 

 savages, i. 62. 



Affection, iiiatcrnaL i. 39 ; manifestation 

 oC by animals, i. .39 ; parental and filial, 

 partly the result of natural selection, i. 

 77 ; shown by birds in confinement, for 

 certjiin persons, ii. 105 : mutual of birds, 

 11. 104. 



Africa, probably the birthplace of man. 1. 

 191 ; ijouth, crossed population of^ i. 217, 



South, retention of color by the Dutch 

 in, i. 233 ; South, proportion of the sexes 

 in the butterflies o^ i. 301 ; tattooing 

 practised in. ii. 323 ; Northern, coiffure 

 of natives of ii. 324. 



Agassiz, L., on conscience in dogs. i. 75; 

 on the coincidence of the races, of man 

 with zoological provinces. 1. 210; on the 

 number of species of man, i. 21S; on the 

 courtship of the land-snails, i. 815; on 

 the brightness of the colors of male fishes 

 during the breeding-season, ii. 12 ; on the 

 frontal protuberance of the males, of 

 Geoi>}uigiu< and Cichhi. ii. 13, 26 ; on the 

 slight sexual differences of the South 

 Americans, ii. 308 ; on the tattooing of 

 the Aiuuzouian Indians, ii. 326. 



Age, in relation to the transmission of 

 characters in birds, ii. 175; variation in 

 accordance with, in birds, ii. 203. 



Age/wus Pfunniceiis, ii. 111. 



Ageronia /eronia, noise produced by, L 

 375. 



Agrion. dimorphism in. i. 352. 



Agrion liamhiirii, sexes ot, i. 351. 



AC.RION1D.E, difference in the sexes ot, i 

 361. 



Agrotis erclnmationiJi. i. 35S. 



AofE, tertian, dog suffei-ing from, i. 12. 



Aithiiru-H po/i/tmiu). young ot, ii, 211. 



AioNos, hairiness of the. ii. 306. 



A/c(i ton! (I, young of ii. 203. 



A/''^Ji palmatd. ii. 247. 



Alder and Hancock, >rM., on the uudl- 

 branch mollusca. i. 817. 



Ai.(iKN, Mr., on the stridulation of &o/y<i«, 

 i. 368. 



Allen, J. A., on the relative size of the 

 sexes of Cal/orhinus ursinus, ii. 24S; 

 on the mane of Otaria juhata, ii. 255: 

 on the pairing of seals, ii. 257 ; on sexual 

 ditt'erences in the color of bats. ii. 273. 



Allen. S., on the habits of //oploptenui, 

 ii. 46; on the plumes of herons, ii. 79; 

 on the vernal moult of IleroJias, biibul- 

 cux, ii. SO. 



Allioatob, court.ship of the male, 1. 264^ 

 ii. 27 ; roaring of the male, i. 322. 



