850 



INDEX 



Polydactylism, in man, 60. 



Polygamy, influence of, upon sexual 

 selection, 286; superinduced by do- 

 mestication, 290; supposed increase 

 o£ female births by, 321 ; in the 

 stielsleback, 432. 



Polygenists, 234. 



Polynesia, prevalence of infanticide in, 

 761. 



Polynesians, wide geographical range 

 of, 50 ; difference of stature among 

 the, 52; crosses of, 231; variability 

 of, 232; heterogeneity of the, 255; 

 aversion of, to hairs on the face, 

 lil. 



Polyplectron, number of spurs in, 413 ; 

 display of plumage by the male, 512 ; 

 gradation of characters in, 55t ; fe- 

 male of, 607. 



chinquis, 512, 557. 



Hardwickii, 557. 



malaecense, 558-559. 



Napoleonis, 557, 559. 



Polyzoa, 347. 



Pontoporeia affinis, 351. 



Porcupine, mute, except in the rutting 

 season, 679. 



Pores, excretory, numerical relation of, 

 to the hairs in sheep, 262. 



Porpitje, bright colors of some, 345. 



Portax picta, dorsal crest and throat- 

 tuft of, 686 ; sexual difEerences of 

 color in, 692, 701. 



Portunus puber, pugnacity of, 355. 



Potamochoerus penicillatus, tusks and 

 facial knobs of the, 671. 



Pouchet, G., the relation of instinct to 

 intelligence, 96-97 ; on the instincts 

 of ants, 198 ; on the caves of Abou- 

 Simbel, 225 ; on the immunity of 

 negroes from yellow fever, 256 ; 

 change of color in fishes, 447. 



Pouter pigeon, late development of the 

 large crop in, 313. 



Powell, Dr., on stridulation, 371. 



Power, Dr., on the different colors of 

 the sexes in a species of Squilla, 

 357. 



Powys, Mr., on the habits of the chaf- 

 finch in Corfu, 327. 



Pre-eminence of man, 73. 



Preference for males by female birds, 

 534, 543; shown by mammals in 

 pairing, 674. 



Prehensile organs, 276. 



Presbytia entellus, fighting of the male, 

 723. 



Preyer, Dr., on function of shell of ear, 

 32 ; on supernumerary mammEe in 

 women, 59. 



Priohard, on the difference of stature 

 among the Polynesians, 62; on the 

 connection between the breadth of 

 the skull in the Mongolians, and the 

 perfection of their senses, 56; on 

 the capacity of British skulls of dif- 

 ferent ages, 81 ; on the flatleried 

 heads of the Colombian savages, 

 740; on Siamese notions of beauty, 

 744; on the beardlessness of the 

 Siamese, 721; on the deformation of 

 the head among American tribes and 

 the natives of Arakhan, 750. 



Primary sexual organs, 274. 



Primates, 200, 271; sexual differences 

 of color in, 693. 



Primogeniture, evils of, 182-183. 



Prionidee, difference of the sexes in 

 color, 386. 



Proototretus multimaculatus, 464. 



tenuis, sexual difference in the 



color of, 464. 



Profligacy, 185. 



Progenitors, early, of man, covered 

 with hair, 214-215. 



Progress, not the normal rule in human 

 society, 179; dependent on favorable 

 conditions, 179; elements of, 191. 



Prong-horn antelope, horns of, 309. 



Proportions, difference of, in distinct 

 races, 223. 



Protective coloring in butterflies, 407; 

 in lizards, 465; in birds, 610, 632; 

 in mammals, 700. 



nature of the dull coloring of 



female Lepidoptera, 419, 421, 423. 



resemblances in fishes, 447. 



Protozoa, absence of secondary sexual 



characters in, 344. 



Pruner-Bey, on the occurrence of the 

 supracondyloid foramen in the hu- 

 merus of man, 42; on the color of 

 negro infants, 718. 



Prussia, numerical proportion of male 

 and female births in, 320. 



Psocus, proportions of the sexes in, 

 336. 



Ptarmigan, monogamous, 290 ; summer 

 and winter plumage of the, 505-506; 

 nuptial assemblages of, 524; triple 



