PREFACE. 



delivery, either as a course or separately, al- 

 though this makes repetition unavoidable. 

 Nothing, perhaps, would be gained by at- 

 tempting to avoid this. It is hoped that they 

 may at least prove acceptable to those who 

 have listened to them, and to those who hon- 

 estly ask the question, " What is the use of the 

 Naturalist's work ?" 



BOWDOIN COLLEGE, 1860, 



