^92 INDEX. 



Variability, causes of, 31; in man, analogous to that in the lower 

 animals, 33; of the races of man, 198 ; greater in men than in 

 women, 252; period of, relation of the, to sexual selection, 272; of 

 birds, 479; of secondary sexual characters in man, 638. 



Variation, laws of, 33; correlated, 48; in man, 166; analogous, 173; 

 analogous, in plumage of birds, 438. 



Variations, spontaneous, 49. 



Varieties, absence of, between two species, evidence of their dis- 

 tinctness, 189. 



Variety, an object in nature, 561. 



Variola, communicable between man and the lower animals, 7. 



Vaureal, human bones from, 24. 



Veddahs, monogamous habits of, 675. 



Veitch, Mr., on the aversion of Japanese ladies to whiskers, 663. 



Vengeance, instinct of, 127. 



Venus Erycina, priestesses of, 670. 



Vermes, 299. 



Vermiform appendage, 23. 



Verreaux, M. , on the attraction of numerous males by the female 

 of an Australian Bonibyx, 284. 



Vertebrae, caudal, number of, in macaques and baboons, 65; of 

 monkeys, partly imbedded in the body, 66. 



Vertebrata, 375; common origin of the, 180; most ancient progeni- 

 tors of, 183; origin of the voice in air breathing, 646. 



Vesicula prostatica, the homologue of the uterus, 26, 183. 



VibrisssB, represented by long hairs in the eyebrows, 20. 



Vidua, 457, 526; vidua axillaris, 248. 



Villerme, M., on the influence of plenty upon stature, 35. 



Vinson, Aug., courtship of male spider, 308 ; on the male of 

 Epeira 7iigra, 309. 



Viper, difference of the sexes in the, 398. 



Virey, on the number of species of man, 199. 



Virtues, originally social only, 132; gradual appreciation of, 148. 

 Viscera, variability of, in man, 30. 



Vlacovich, Prof., on the ischio-pubic muscle, 46. 



Vocal music of birds, 417; vocal organs of man, 98; of birds, 96, 

 512; of frogs, 397; of the Insessores, 421; difference of, in the sexes 

 of birds, 421; primarily used in relation to the propagation of the 

 species, 646. 



Vogt, Karl, on the origin of species, 1; on the origin of man, 3; 

 on the semilunar fold in man, 19; on microcephalous idiots, 40; on 

 the imitative faculties of microcephalous idiots, 98; on skulls from 

 Bra/ilian caves, 192, on the evolution of the races of man, 201; on 

 the formation of the skull in women, 635; on the Ainos and negroes, 

 639; on the increased cranial difference of the sexes in man with 

 race development, 645; on the obliquity of the eye in the Chinese 

 and Jai)anese, 659. 



Voice in mammals, 600; in monkeys and man, 636; in man, 645; 

 origin of, in air-breathing vertebrates, 646. 



Von Baer, see Baer. 



V^ulpian, Prof., on the resemblance between the brains of man and 

 the higher apes, 6. 



Vultures, selection of a mate by the female, 473; colors of, 561. 



