PREFACE. 



IX 



Cole and Davis, A Biological Survey of the Waters of Woods 

 Hole and Vicinity, Bui. U. S. Bur. Fish., 30, 1911. 



It has been my part to put the original directions into book 

 form and to see that desirable changes were made in them, 

 but much credit belongs to the men who have been associated 

 with me in the instruction work at the Marine Biological 



Laboratory. 



The Author. 



