226 
BULLETIN OF THE BUREAU OF FISHERIES 
The nearly uniform horizontal distribution of the temperature and the fact 
that there is but slight change in the temperature of the water during one complete 
tidal cycle (June 26) indicate that the comparatively cool water of Buzzards Bay, 
which enters Onset Bay with the flood tide, warms up when passing through the 
shallow channels at the entrance of the bay and by coming in contact with the 
exposed and warm tidal flats. 
Table 14. — Horizontal distribution of temperature and salinity at the surface of Onset Bay, summer 1928 
UPPER SECTION 
Station number 
June 17, 1928 
June 26, 1928 
Aug. 20, 1928 
Sept. 4, 1928 
High water at 7.00 
a. m. 
Low water at 7.51 
a. m. 
High water at 3.16 
p. m. 
High water at 10.05 
a. m. 
Low water at 3.53 
a.m. 
Time 
Tem- 
pera- 
ture, 
° C. 
Salin- 
ity, 
per 
mille 
Time 
Tem- 
pera- 
ture, 
° C. 
Salin- 
ity, 
per 
mille 
Time 
Tem- 
pera- 
ture, 
° C. 
Salin- 
ity, 
per 
mille 
Time 
Tem- 
pera- 
ture, 
° C. 
Salin- 
ity, 
per 
mille 
Time 
Tem- 
pera- 
ture, 
° C. 
Salin- 
ity, 
per 
mille 
1 
a. m. 
8.37 
8. 41 
8. 45 
8.49 
8. 52 
8. 57 
9.00 
9.04 
9.08 
19.3 
19.5 
19.7 
19.0 
19.3 
19.6 
19.1 
19.4 
19.1 
28.60 
28.21 
27.92 
27.65 
28.19 
28.31 
28.71 
29.58 
29.33 
a. m. 
8. 27 
19.2 
27.05 
26.98 
27.57 
27. 78 
28.13 
28.33 
28.73 
28. 66 
28.73 
p. m. 
3.31 
3.28 
3.25 
19.7 
19.8 
19.8 
28.84 
28.48 
28. 41 
a. m. 
11. 56 
11. 54 
11. 53 
25.0 
24.9 
25.0 
29.72 
29.79 
29.66 
29.66 
29.72 
29.05 
29.72 
30.05 
29.85 
a. m. 
5. 51 
5.52 
5.49 
5.47 
5. 45 
5.49 
5.40 
5.39 
5.37 
27.64 
26.97 
27.23 
27.77 
28. 78 
28. 39 
28. 78 
28.31 
28.26 
2 
20.8 
3 
4 
5 
3. 17 
19.6 
29. 13 
28.78 
28.93 
29.05 
29.13 
6 
11.44 
24.6 
7 
21.1 
8 
8.53 
19.0 
3.09 
19.4 
9 
11. 36 
24.8 
MIDDLE SECTION 
10 
9. 12 
19.2 
29.27 
28. 86 
29.13 
11. 34 
24.4 
29.92 
5. 34 
28. 65 
11 
9. 14 
19.3 
29.40 
28.89 
3.00 
19.0 
29. 38 
30. 12 
6. 30 
27. 50 
12 
9.25 
19.0 
29.38 
9.00 
19.0 
28. 13 
2. 55 
19.2 
28. 98 
30. 12 
5.28 
27. 17 
13 
9. 35 
18.8 
29.67 
28. 59 
29. 23 
11. 25 
24.3 
30. 12 
5. 27 
27. 70 
14 
9.38 
18.9 
29. 98 
29. 13 
2. 52 
30. 71 
30. 05 
5. 25 
22.0 
27. 14 
15 
9, 41 
18.8 
29. 85 
28. 60 
2.50 
19.2 
29.45 
11. 22 
30. 32 
5. 22 
28. 85 
16 
9. 45 
19.0 
29.52 
28.46 
2.48 
19.4 
29. 58 
30. 12 
5.20 
29. 02 
17. 
9. 47 
19.0 
29. 17 
28.21 
2. 44 
29. 09 
30. 12 
5. 18 
28. 45 
18 
28. 66 
2.41 
19.4 
29. 45 
11. 15 
23.7 
30. 12 
5. 17 
29. 11 
19 
9. 22 
18.8 
28. 79 
2.39 
29. 65 
30. 18 
5. 12 
28. 85 
20 
29. 10 
29. 98 
11. 10 
23.4 
30. 44 
5. 10 
21. 1 
29. 38 
21 
9.27 
18.6 
29. 20 
29. 93 
11.07 
30. 18 
5. 08 
30. 01 
22 
9. 30 
18. 5 
29. 33 
29. 92 
11.03 
25.6 
30. 25 
5. 05 
29. 01 
23..... 
9. 42 
18. 6 
29. 33 
2.27 
30. 05 
11. 00 
24.6 
30.25 
5,03 
21. 2 
29. 40 
24 - 
29.72 
2.24 
19.5 
29. 85 
10.37 
24.2 
30. 18 
4. 53 
29.33 
LOWER SECTION 
25 
29.99 
30.13 
30.19 
30. 07 
30.07 
30.05 
30. 13 
30.12 
30.12 
30.12 
30.44 
30.70 
30.44 
30.44 
30. 50 
4.50 
4. 46 
4.44 
4.43 
4.40 
29.88 
29.88 
29. 72 
29. 46 
30.05 
26 
10.52 
10.43 
21.3 
27 
28 
10.04 
10.07 
18.5 
18.4 
29 
2.14 
18.9 
10.57 
24.2 
SALINITY 
Daily observations of salinity made in the summers of 1927 and 1928 (fig. 16) 
by means of hydrometer readings show that during the first summer the concentration 
of salts varied from 24.99 to 29.07 per mille; during the second summer, the fluctua- 
tions were from 27.65 to 29.85. By examining Figure 16 one can see that the lower 
salinities of the summer of 1927 were apparently due to the higher precipitation 
during that year. 
A study of the horizontal distribution of salinities was made in 1928 on the days 
when the distribution of the temperature was studied. It is clear from the examina- 
tion of Table 14 and Figure 17 that the salinity increases from 27.05-29.72 at the 
