Chap XIX. LAW OF BATTLE. 323 



in Europeans, and the women have none on the corre- 

 sponding parts. The hair on the head, however, attains 

 an extraordinary length in both sexes, often reaching 

 almost to the ground ; and this is likewise the case with 

 some of the N. American tribes. In the amount of 

 hair, and in the general shape of the body, the sexes 

 of the American aborigines do not differ from each 

 other so much as with most other races of manldnd.^^ 

 This fact is analasfous with what occurs with some allied 

 monkeys ; thus the sexes of the chimpanzee are not as 

 different as those of the gorilla or orang.^° 



In the previous chapters we have seen that with 

 mammals, birds, fishes, insects, &c., many characters, 

 which there is every reason to believe were primarily 

 gained through sexual selection by one sex alone, have 

 been transferred to both sexes. As this same form of 

 transmission has apparently prevailed to a large extent 

 with mankind, it will save much useless repetition if 

 we consider the characters peculiar to the male sex 

 together with certain other characters common to both 

 sexes. 



Law of Battle. — With barbarous nations, for instance 

 with the Australians, the women are the constant cause 

 of war both between the individuals of the same tribe 

 and between distinct tribes. So no doubt it was in 

 ancient times ; " nam fuit ante Helenam mulier teter- 

 " rima belli causa." With the North American Indians, 

 the contest is reduced to a systeni. That excellent ob- 



^^ Prof, and IMrs. Agassiz (' Journey in Brazil,' p. 530) remark 

 that the sexes of the American Indians differ less than those of the 

 negroes and of the higher races. See also Eengger, ibid. p. 3, on the 

 Guaranys. 



'^'^ Riitimeycr, 'Die Grenzen der Thierwelt; eiue Betrachtuug zu 

 Darwin's Lehre,' 1868, s. 54. 



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