444 THE CAUSES OF THE XI 
so term it—depending for its success on the 
strength of the cloth of the Cuirassier’s cloak. It 
is the same in nature ; every species has its bridge of 
Beresina ; it has to fight its way through and strug- 
gle with other species ; and when well-nigh over- 
powered, it may be that the smallest chance, some- 
thing in its colour, perhaps—the minutest cireum- 
stance—will turn the scale one way or the other. 
Suppose that by a variation of the black race it 
had produced the white man at any time—you 
know that the Negroes are said to believe this to 
have been the case, and to imagine that Cain 
was the first white man, and that we are his 
descendants—suppose that this had ever hap- 
pened, and that the first residence of this human 
being was on the West Coast of Africa. There is no 
great structural difference between the white man 
and the Negro, and yet there is something so sin- 
gularly different in the constitution of the two, 
that the malarias of that country, which do not 
hurt the black at all, cut off and destroy the white. 
Then you see there would have been a selective | 
operation performed ; if the white man had risen 
in that way, he would have been selected out and 
removed by means of the malaria. Now there 
really is a very.curious case of selection of this 
sort among pigs, and it is a case of selection of 
colour too. In the woods of Florida there are a 
great many pigs, and it isa very curious thing that 
they are all black, every one of them. Professor 
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