ANIMAL BIOLOGY. [Chap. I. 



a base-line sufficiently accurate and extensive to enable him, by 

 further study and research, to carry on his survey of the animal 

 kingdom. Space will not permit of the study of the facts of dis- 

 tribution. And with regard to Etiology, the aim will be rather 

 to pave the way for a study of causes by an accurate presentation 

 of facts than to deal at any length and more than incidentally 

 with the theory of Evolution or the Doctrine of Descent. 



