INTRODUCTION 7 



ments of length and depth made by a micrometer. During the last men- 

 tioned summer (1909), I added the quahaug (Venus) to the list of known 

 larvse, reviewed the whole field of oyster development from the egg to the 

 adult, dwelling particularly on the time of ripening of the eggs and spawn- 

 ing, the first occurrence of larvse in the water, and the first appearance of 

 spat, as well as performing successful fertilization and culture experiments. 

 During the summer of 1910 I was again stationed at St. Andrews 

 N.B., where I could do nothing more on the oyster; but the greater part 

 of the summer of 1911 was spent at Nanaimo, B.C., where I succeeded in 

 proving that the Atlantic oyster can be successfully cultivated in Pacific 

 waters, and made out the mode of breeding of the little British Columbian 

 oyster {Ostrea liirida, Carp.). 



