IKDBX. 775 



Polygamy, influence of, upon sexual selection, 245; superinduced 

 by domestication, 249; supposed increase of female births by, 277; in 

 the stickleback, 376. 



Polygenists, 200. 



Polynesia, prevalence of infanticide in, 676. 



Polynesians, wide geographical range of, 33; difference of stature 

 among the, 35; crosses of, 198; variability of, 198; heterogeneity of 

 the. 219; aversion of, to hairs on the face, 662. 



Polyplectron, number of spurs in, 413; display of plumage by the 

 mal, 450; gradation of characters in, 490, female of, 536; polyplect- 

 ron chinquu, 450, 491 ; polyplectron hardwickii, 491 ; polypleetron 

 malac4^^ne, 491, 492. 



Polyplectron Napokonis, 490, 492. 



Polvzoa, 296. 



Pomotis, 391. 



Pontoporeia affinis, 300. 



Porcupine, mute, except in the rutting-season, 600. 



Pores, excretory, numerical relation of, to the hairs in sheep, 225. 



PorpitcB, bright colors of some, 295. 



Portax picta, dorsal crest and throat-tuft of, 606; sexual differences 

 of color in, 611, 612, 621. 



Portuniis puber, pugnacity of, 304. 



Potamocharus penicillatus, tusks and facial knobs of the, 593, 



Pouchet U., the relation of instinct to intelligence, 75; on the 

 instincts of ants, 168; on the caves of Abou-Simbel, 191; on the 

 immunitv of negroes from vellow fever, 220; change of color in 

 fishes, 390. 



Pouter-pigeon, late development of the large crop in, 269. 



Powell, Dr., on stridulation, 319. 



Power, Dr., on the different colors of the sexes in a species of 

 Squilla, 306. 



Powys, Mr., on the habits of the chaflBnch in Corfu, 281. 



Pre-eminence of man, 54. 



Preference for males by female birds, 470, 477; shown by mammals, 

 in pairing, 595. 



Prehensile organs, 237. 



Presbytis entellus, fighting of the male, 641. 



Preyer, Dr., on function of shell of ear, 15; on supernumerary 

 mammae in women, 41. 



Prichard, on the difference of stature among the Polynesians, 35; 

 on the connection between the breadth of the skull in the Mongolians 

 and the perfection of their senses, 38; on the capacity of British 

 skulls of different ages, 61 ; on the flattened heads of the Colombian 

 savages, 655; on Siamese notions of beauty, 659; on the beard lessness 

 of the Siamese, 663; on the deformation of the head among American 

 tribes and the natives of Arakhan, 665. 



Primary sexual organs, 234. 



Primates, 170, 233; sexual differences of color in, 613. 



Primogeniture, evils of, 153. 



Prionidae, difference of the sexes in color, 333. 



Proctotretns multimaculatus^ 406; proetotretus tenuis, sexual differ- 

 ence in the color of, 406. 



Profligacy, 155. 



