220 
THE DESCENT OF MAN. 
Part II 
were darker coloured and appeared different from those 
proper to the natives of Chiloe in South America, of 
which he gave me specimens. These, again, appeared 
larger and much softer than European lice. Mr. Murray 
procured four kinds from Africa, namely from the* 
Negroes of the Eastern and Western coasts, from the 
Hottentots and Caffres; two kinds from the natives 
of Australia ; two from North, and two from South 
America. In these latter cases it may be presumed 
that the Pediculi came from natives inhabiting different 
districts. With insects slight structural differences, if 
constant, are generally esteemed of specific value : and 
the fact of the races of man being infested by parasites, 
which appear to be specifically distinct, might fairly 
be urged as an argument that the races themselves- 
ought to be classed as distinct species. 
Our supposed naturalist having proceeded thus far 
in his investigation, would next inquire whether the 
races of men, when crossed, were in any degree sterile*. 
He might consult the work 9 of a cautious and philo- 
sophical observer, Professor Broca ; and in this he would 
find good evidence that some races were quite fertile* 
together ; but evidence of an opposite nature in regard to 
other races. Thus it has been asserted that the native 
women of Australia and Tasmania rarely produce 
children to European men ; the evidence, however, on 
this head has now been shewn to be almost valueless*. 
The half-castes are killed by the pure blacks ; and an 
account has lately been published of eleven half-caste 
youths murdered and burnt at the same time, whose 
remains were found by the police . 10 Again, it has often 
9 ‘On tlie Phenomena of Hybridity in the Genus Homo/ Eng?, 
translat. 1861. 
10 See the interesting letter by Mr. T. A. Murray, in the 4 Anthro- 
pology Review,’ April, 1868, p. liii. In this letter Count Strzelecki’s 
