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 mankind.^^ 
This fact is analagous 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 system. That excellent ob- 
Prof, and Mrs. 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. 
Kiitimeyer, ‘Die Grenzen der Thierwelt; eine Betrachtung zu 
Darwin’s Lehre/ 1868, s. 54. 
Y 2 
