18 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 
VI. THe CONTINUED EXAMINATION OF THE PHYSICAL AND BIOLOGI- 
CAL CONDITIONS OF THE WATERS OF THE Bay, BEGUN IN 1898. 
During the past season a daily record was kept of the density 
and temperature of the water; a daily record of the microscopic 
plants and animals taken at the surface of the water with a fine 
tow-net; and also miscellaneous notes regarding other physical 
and biological conditions—all of which are preserved for future 
reference. 
Mr. George A. Griffin, of Wakefield, has informed the commis- 
sion of some interesting facts concerning the results to the oyster 
and clam industry which followed the opening of the breach into 
Point Judith pond, early in the summer 1901. Formerly, before the 
breach{was closed, oysters and clams were abundant in this pond— 
the clams growing to remarkable size, while the oysters were 
stunted. When the breach remained closed for a considerable time, 
the water became so fresh that all of the lobsters and clams were 
killed; and this was the condition of things in the early part 
of 1901. During the spring, My. Griffin planted a number of 
oysters and clams in the pond after the breach had been 
opened, in the hope that the canal which was to be built dur- 
ing the summer would keep the breach permanently open. The 
canal has been dug, and oysters and clams have set abundantly 
throughout the whole pond. A sample of the oysters is shown in 
the accompanying figure. 
VII. A ConTINUANCE OF THE SURVEY OF THE SHORES OF THE Bay, 
MADE FoR THE PurPosE oF DETERMINING THOSE PORTIONS 
Wuicu are Mosr PropuctTivE oF YOUNG SEED-CLAMS. 
Many miles of the shore were examined for seed-clams, and, as 
will be seen in the next chapter, very many were very thick in 
certain localities. The data collected from year to year in this 
way will be valuable in the future work of the commission. One 
