PRODUCTION AND COLLECTION OF SEED OYSTERS 
211 
the first on July 23 and the second on August 4, when the temperature of the water 
reached 27.0° C. and 28.0° C., respectively. The general rise and fall of the water 
temperature followed the fluctuations of the air temperature It is interesting to 
note that the curve of water temperature approaches the curve of the maximum air 
temperature, although, as one should expect, the fluctuations in the temperature of 
the water are not so pronounced as those of the air temperature. The vertical 
July August 
Figure 6. — Maximum and minimum air temperature, precipitation, temperature, and salinity of water 
in Wareham River, July-August, 1926 
distribution of water temperature was rather uniform; slight differences between top 
and bottom temperatures, not exceeding 1.5° C. (July 23), were noticeable only in the 
channel. 
SALINITY OF THE WATER 
The salinity of water in Wareham River gradually decreases from about 30 per 
mille at its mouth to about 21 per mille in the upper part pf the river near the 
railroad bridge. After rainy days, August 13 to 16 (fig. 6, Table 3), the salinity 
119414—30 3 
