PRODUCTION AND COLLECTION OF SEED OYSTERS 
243 
per mille though as a general rule the daily fluctuation was from 25 to 28 per mille. 
The changes in salinity that occur during a complete tidal cycle are shown in Figure 
28 together with the observations on temperature and pH. The results obtained in 
this series of observations, which were made on August 24, 1925, from time of low 
water to high water and back again, are given in Table 26. 
