212 Darwin, and after Darwin. 
Old World cousins in form and habits; but differ 
from them in dentition and other such minor points. 
Now, the question is;—Why should all the 100 
species have been separately created on one side 
of the Atlantic with one pattern of dentition, and 
all the 70 species on the other side with another 
pattern? What has the Atlantic Ocean got to do 
with any “archetypal plan ” of rats’ teeth? 
Or again, to recur to Australia, why should all 
the mammalian forms of life be restricted to the 
one group of Marsupials, when we know that not 
only the Rodents, such as the rabbit, but all other 
orders of mammals, would thrive there equally well. 
And similarly, of course, in countless other instances. 
Everywhere we meet with this same correlation 
between areas of distribution and affinities of classifi- 
cation. 
Now, it is at once manifest how completely this 
general fact harmonizes with the theory of evolution. 
If the 4co specics of humming-birds, for instance, are all 
modificd descendants of common ancestors, and if none 
of their constituent individuals have ever been large 
enough to make their way across the oceans which 
practically isolate their territory from all other tropi- 
cal and sub-tropical regions of the globe, then we can 
understand why it is that all the 400 species occupy 
the same continent. But on the special-creation 
theory we can see no reason why the 400 species 
should all have been deposited in America. And, as 
already observed, we must remember that this corre- 
lation betwcen a geographically restricted habitat 
and the zoological or botanical affinities of its inhabi- 
tants, is repeated over and over and over again in the 
