Page:Descent of Man 1875.djvu/686

670

domestication, 220; supposed increase of female births by, 245; in the stickleback, 332.
 * Polygenists, 176.
 * Polynesia, prevalence of infanticide in, 592.
 * Polynesians, wide geographical range of 29; difference of stature among the, 31; crosses of, 173; variability of, 174; heterogeneity of the, 192; aversion of, to hairs on the face, 581.
 * Polyplectron, number of spurs in, 364; display of plumage by the male, 396; gradation of characters in, 431; female of, 471.
 * chinquis, 397, 432.
 * Hardwickii, 432.
 * malaccense, 432, 433.
 * Napoleonis, 432, 433.
 * Polyzoa, 262.
 * Pontoporeia affinis, 266.
 * Porcupine, mute, except in the rutting season, 526.
 * Pores, excretory, numerical relation of, to the hairs in sheep, 198.
 * Porpitœ, bright colours of some, 260.
 * Portax picta, dorsal crest and throattuft of, 530; sexual differences of colour in, 535, 543.
 * Portunus puber, pugnacity of, 269.
 * Potamochœrus penicillatus, tusks and facial knobs of the, 520.
 * Pouchet, G., the relation of instinct to intelligence, 67; on the instincts of ants, 147; on the caves of Abou-Simbel, 168; on the immunity of negroes from yellow fever, 193; change of colour in fishes, 344.
 * Pouter pigeon, late development of the large crop in, 238.
 * Powell, Dr., on stridulation, 281.
 * Power, Dr., on the different colours of the sexes in a species of Squilla, 271.
 * Powys, Mr., on the habits of the chaffinch in Corfu, 248.
 * Pre-eminence of man, 48
 * Preference for males by female birds, 414, 420; shewn by mammals, in pairing, 522.
 * Prehensile organs, 209.
 * Presbytis entellus, fighting of the male, 562.
 * Preyer, Dr., on function of shell of ear, 14; on supernumerary mammæ in women, 37.
 * Prichard, on the difference of stature among the Polynesians, 31; on the connection between the breadth of the skull in the Mongolians and the perfection of their senses, 34; on the capacity of British skulls of different ages, 55; on the flattened heads of the Colombian savages, 575; on Siamese notions of beauty, 578; on the beardlessness of the Siamese, 581; on the deformation of the head among American tribes and the natives of Arakhan, 583.
 * Primary sexual organs, 207.
 * Primates, 149, 205; sexual differences of colour in, 537.
 * Primogeniture, evils of, 135.
 * Prionidæ, difference of the sexes in colour, 294.
 * Proctotretus multimaculatus, 358.
 * tenuis, sexual difference in the colour of, 358.
 * Profligacy, 137.
 * Progenitors, early, of man, 160.
 * Progress, not the normal rule in human society, 133; elements of, 141.
 * Prong-horn antelope, horns of, 234.
 * Proportions, difference of, in distinct races, 167.
 * Protective colouring in butterflies, 312; in lizards, 358; in birds, 473, 489; in mammals, 542.
 * nature of the dull colouring of female Lepidoptera, 321, 322, 324.
 * resemblances in fishes, 344.
 * Protozoa, absence of secondary sexual characters in, 260.
 * Pruner-Bey, on the occurrence of the supra-condyloid foramen in the humerus of man, 22; on the colour of negro infants, 557.
 * Prussia, numerical proportion of male and female births in, 243.
 * Psocus, proportions of the sexes in, 254.
 * Ptarmigan, monogamous, 219; summer and winter plumage of the, 390, 392; nuptial assemblages of, 406; triple moult of the, 462; protective coloration of, 473.
 * Puff-birds, colours and nidification of the, 455.