RECOMMENDED AT OUR UNIVERSITIES. 377 
rently anomalous, are brought together, and are 
shown to be but modifications of one and the same 
principle. Natural history alone has hitherto re- 
mained unhonoured by such names.  Linnzus 
saw the station which his favourite science should 
hold, but, with so few materials and facts before him, 
he wisely abstained from attempting philosophic 
generalisations. Much, indeed, has been said, by 
those who should have known better, about what has 
been termed the daw of co-relation, of which a late 
celebrated naturalist of France has been extolled as 
the discoverer, but which has been known to every 
naturalist since the days of Aristotle; this law of 
co-relation being, in fact, no other than that the 
structure of an animal is adapted to its economy 
and habits. 
(259.) Such being the state of the philosophy of 
zoology, can we imagine, that if its cultivation had 
been fostered, it would not have reached a higher 
altitude in the rank of the demonstrative sciences ? 
Are we to suppose, for a moment, that it is exempt 
from the influence of definite laws, and that the 
almost infinite variety of form and structure in the 
objects it embraces, cannot be reduced to a few pri- 
mary types, or that the mode of their variation is 
fluctuating and indefinite? If we reject all such sup- 
positions, as being at variance with the whole analogy 
of nature, under what circumstances can we suppose 
such discoveries are most likely to be made? Cer- 
tainly by those whose minds have been disciplined 
in the universities, and who have not only acquired 
alove for abstract truth, but who are qualified to 
pursue it in a philosophic spirit. Now, if the very 
