Viii PREFACE. 
Believing, as he does, that such inferences are more satisfac- 
torily based upon the general manifestations of Zaw and 
Order, than upon individual instances of Design, he has 
thought it the legitimate object of this treatise to lay the 
foundation for them, by developing, so far as might be, the 
Prineiples of Physiology,—leaving it to special treatises on 
Natural Theology, to build-up the applications. 
University Hatt, Lonpon, 
Jan. 1859. 
