318 
SEXUAL selection: man. 
Part II. 
cannot be detected in the infantile skull.^ In regard to 
colour, the new-born negro child is reddish nut-brown, 
which soon becomes slaty-grey ; the black colour being 
fully developed within a year in the Sudan, but not 
until three years in Egypt. The eyes of the negro are 
at first blue, and the hair chesnut-brown rather than 
black, being curled only at the ends. The children of 
the Australians immediately after birth are yellowish- 
brown, and become dark at a later age. Those of the 
Guaranys of Paraguay are whitish-yellow, but they 
acquire in the course of a few weeks the yellowish- 
brown tint of their parents. Similar observations have 
been made in other parts of America.^ 
I have specified the foregoing familiar differences be- 
tween the male and female sex in mankind, because they 
are curiously the same as in the Quadrumana. With 
these animals the female is mature at an earlier age than 
the male ; at least this is certainly the case with the 
Cebus azarse^ With most of the species the males are 
larger and much stronger than the females, of which 
fact the gorilla offers a well-known instance. Even in 
so trifling a character as the greater prominence of the 
superciliary ridge, the males of certain monkeys differ 
from the females,^ and agree in this respect with man- 
kind. In the gorilla and certain other monkeys, the 
^ Scliaaff hausen, ‘ Anthropolog. Eeview/ ibid. p. 429. 
^ Pruner-Bey, on negro infants, as quoted by Vogt, ‘Lectures on 
Man/ Eng. translat. 1864, p. 189 : for further facts on negro infants, as 
quoted from Winterbottom and Camper, see Lawrence, ‘Lectures on 
Physiology,’ &c. 1822, p. 451. For the infants of the Guaranys, see 
Eengger, ‘ Saugethiere,’ &c. s. 3. See also Godron, ‘ De PEspece,’ tom. 
ii. 1859, p. 253. For the Australians, Waitz, ‘ Introduct. to Anthro- 
pology,’ Eng. translat. 1863, p. 99. 
® Eengger, ^ Saugethiere,’ &c. 1830, s. 49. 
^ As in Macacus cynomolgus (Desmarest, ‘ Mammalogie,’ p. 65) and 
in Hylobates agilis (Geolfroy St. -Hilaire and F. Cuvier, ‘ Hist. Nat. des 
Mamm.’ 1824, tom. i. p. 2). 
