The Descent of Man

tions of the brain. (3. See, for instance, Mr.
Marshall's account of the brain of a Bushwoman,
in 'Philosophical Transactions,' 1864, p.
519.) But it would be an endless task to specify
the numerous points of difference. The races
differ also in constitution, in acclimatisation
and in liability to certain diseases. Their mental
characteristics are likewise very distinct; chiefly
as it would appear in their emotional, but partly
in their intellectual faculties. Every one who
has had the opportunity of comparison, must
have been struck with the contrast between the
taciturn, even morose, aborigines of S. America
and the light-hearted, talkative negroes. There
is a nearly similar contrast between the Malays
and the Papuans (4. Wallace, 'The Malay Archipelago,'
vol. ii. 1869, p. 178.), who live under
the same physical conditions, and are separated
from each other only by a narrow space of sea.
We will first consider the arguments which
may be advanced in favour of classing the races