OF ZOOLOGICAL FOCI. 149 
lific hand of nature, we find no difficulty in supposing 
that under the same or similar conditions, the same 
species may have been created at different centres. In 
this way the presence of any species in every part of 
the earth may be accounted for, and thus only can we 
satisfactorily explain the diffusion of the species that 
have been under consideration. 
The zoological sections which, in accordance with 
these ideas, we have ventured to propose, are given 
merely as suggestions, indicated by the present state of 
information. It is desirable that the subject should be 
fully investigated, and the correctness of the proposed 
divisions tested. Should they be proved to be untenable, 
we shall very willingly relinquish them, and adopt such 
other views as may be found more consistent with facts. 
vol. 1. 39 
