SPAWNING AND SETTING OF OLYMPIA OYSTERS 
451 
is much greater in the latter bay, indicating the extent of adaptation required of the 
oysters during the tidal cycles. Shown in the figures also is the monthly precipitation 
as recorded at Olympia by C. F. Norrie. Rain is markedly seasonal at this place, with 
almost no rainfall during summer. The low salinity in winter is directly correlated 
with precipitation, though there is considerable lag in the salinity at the bottom. 
Table 5. — Salinity, temperature, and pH in Oyster Bay at 3 different points during summer ( see 
chart, Jig. 3 ) 
Date 
Tide 
Corters Point 
Deepwater Point 
Dike 1 
Surface 
Surface 
Low tide 
Temper- 
ature 
Salinity 
pH 
Temper- 
ature 
Salinity 
pH 
Temper- 
ature 
Salinity 
pH 
° C. 
0 C. 
° C. 
F 
16. 0 
27. 57 
15. 0 
27.94 
22. 2 
27. 66 
F 
17.7 
26. 64 
14.4 
28.28 
18.9 
27. 36 
July 10 
15.3 
28. 40 
8.4 
15.0 
28.37 
8.2 
16.7 
28. 40 
8. 2 
F 
18.0 
28. 60 
8. 4 
28. 60 
8. 4 
27. 2 
28. 75 
8. 0 
July 18 
E 
19. 1 
28. 98 
8.4 
20.5 
28.35 
8.2 
26. 1 
28.63 
8.2 
July 24 
F 
19.6 
28.64 
8.4 
18.3 
28.69 
8.4 
19.4 
28.56 
7.8 
Iuly 27 
F 
17. 2 
29. 29 
8.4 
18.0 
29. 13 
8.4 
27. 2 
29. 09 
7.8 
July 30 
F 
18.9 
29. 02 
8.4 
18.3 
28. 86 
8.4 
27.8 
28. 98 
7.8 
Aug. 1 
E 
19.4 
29. 20 
8.4 
20. 5 
28. 86 
8.4 
25.3 
29.09 
8.0 
Aug. 3 
E 
18.0 
29. 33 
8.4 
18.3 
29. 17 
8.4 
23. 5 
28. 99 
8.0 
Aug. 8 
F 
17.5 
27. 74 
8.2 
17.5 
29. 56 
8.2 
17.5 
28.53 
7.8 
Aug. 11 
F 
17.5 
29. 29 
8.2 
17.8 
29. 1 1 
8. 2 
23.3 
29. 37 
7.8 
Aug. 13 
E 
19.0 
29. 54 
8.2 
19.7 
28. 11 
8.2 
27.2 
28.41 
7.8 
Aug. 15 - 
E 
18.2 
29. 01 
8.2 
18.9 
29. 78 
8.2 
24.4 
29. 65 
7.8 
Aug. 22 
F 
18.4 
29. 13 
8.2 
17. 2 
28.98 
8. 2 
17.5 
29. 13 
7.8 
Aug. 27 
F 
18.7 
29. 99 
8.2 
17.2 
29. 76 
8.2 
23.3 
29.56 
7.8 
Aug. 29 
F 
18.3 
29. 90 
8. 1 
18.9 
29.81 
7.7 
25.0 
29.58 
7.8 
Sept. 8 ._ 
F 
16.7 
29. 52 
8.0 
16.7 
29. 20 
8.0 
16.7 
28.86 
7.6 
Averages. 
17. 97 
28.91 
8.28 
17. 72 
28. 92 
8.23 
23.28 
28.81 
7.91 
Note.— F= flood; E=ebb. 
Table 6 — Average monthly values of salinity and pH at surface and bottom off Corters Point ( Oyster 
Bay ) and Maple Point ( Mud Bay) during 3 years 
Corters Point 
Maple Point 
Date 
Surface 
50 feet 
Surface 
30 feet 
Number 
samples 
Average 
salinity 
Average 
PH 
Average 
salinity 
Average 
pH 
Number 
samples 
Average 
salinity 
Average 
pH 
Average 
salinity 
Average 
pH 
1932 
January 
4 
25. 45 
7. 92 
27. 68 
8.05 
4 
25.06 
8.0 
28.91 
8.0 
February 
3 
26. 68 
8.0 
27. 97 
8.0 
4 
23. 88 
7. 97 
28. 59 
8.0 
March 
5 
24. 27 
8.02 
25. 78 
8. 04 
4 
23. 45 
8.0 
27. 16 
8.0 
April.. 
May 
3 
24. 34 
8.3 
26. 86 
8.3 
4 
25. 37 
8. 33 
27.89 
8.4 
6 
26. 94 
8.4 
27. 69 
8.4 
4 
26. 94 
8.4 
28. 15 
8.4 
June 
3 
27.92 
8.4 
28. 10 
8.4 
4 
27. 42 
8.2 
28.31 
8.3 
July 
3 
28. 34 
8. 27 
28.38 
8. 37 
2 
27. 43 
8. 15 
28.28 
8.2 
August 
4 
28. 32 
8.23 
28.53 
8.3 
5 
28.31 
8. 14 
28.84 
8. 36 
September. 
4 
28. 94 
8.3 
28. 67 
8. 15 
2 
29. 11 
8. 15 
29. 43 
8.2 
October. 
7 
29.01 
8. 01 
29. 20 
8.0 
5 
29.29 
7.98 
29.58 
8.05 
November 
5 
27. 26 
7. 86 
28. 18 
7. 93 
5 
25. 45 
7. 87 
28. 95 
7. 92 
December 
3 
25. 79 
7.73 
26. 78 
7.8 
2 
26. 74 
7.8 
28. 14 
7. 85 
1933 
January 
4 
23. 79 
7.87 
26. 38 
7. 87 
4 
26.27 
7.83 
27.20 
7.9 
February 
4 
25.59 
8.1 
26.21 
8.1 
4 
24. 61 
8.0 
27.47 
8. 1 
March 
4 
24. 10 
8. 13 
26.26 
8. 15 
4 
23. 56 
8. 1 
27.00 
8. 1 
April 
5 
26.05 
8.28 
26. 78 
8. 34 
4 
24. 76 
8.27 
27. 46 
8.3 
May 
12 
27. 11 
8. 24 
27.66 
8.28 
8 
26.81 
8.23 
27. 92 
8.31 
June 
11 
27.75 
8. 13 
28.00 
8. 18 
12 
26. 29 
8. 17 
28.41 
8.23 
July 
11 
28. 30 
8. 15 
28. 46 
8. 18 
11 
27. 50 
8. 05 
28. 70 
8. 12 
August... 
11 
28. 43 
8. 12 
28.57 
8. 12 
12 
27. 84 
8.03 
28.51 
8.04 
September 
6 
28. 67 
8. 07 
28. 95 
8. 13 
7 
28.32 
8.0 
28.59 
7. 99 
October... 
4 
27. 79 
8.1 
28.23 
8. 1 
4 
27. 48 
8. 02 
28. 86 
8. 02 
November 
4 
26. 13 
7.8 
26. 96 
7.8 
4 
26. 40 
7.8 
27. 30 
7.8 
December 
3 
20.53 
7.8 
25. 32 
7.8 
1 
18.58 
7.8 
27. 17 
7.8 
