EFFECT OF CRUDE OIL POLLUTION ON OYSTERS 175 
Table 11 . — -The effect of water-soluble fraction of Lake Barre oil on the rate of pumping of water by 
the gills of the oyster 
[Cone method, Beaufort, 1934] 
Experiment no. 
Date 
Average ve- 
locity, current 
Effect 
of treat- 
Dura- 
tion of 
Specific gravity, 
17.5° C. 
Increase 
in spe- 
cific 
Number 
of times 
Tempera- 
ture (° C.) 
Before 
Dur- 
ing 
ment 
(percent) 
test in 
hours 
Labora- 
tory sea 
water 
Soluble 
fraction 
gravity 
due to 
washing 
oil 
washed 
Begin- 
ning 
End 
Q2 
CONTROL 
June 5 
27 
38 
140.0 
59 
1.0211 
25. 0 
25. 4 
98 .. 
June 13 
29 
36 
124. 1 
24 
1. 0243 
25. 4 
23. 7 
115 
June 27 
44 
43 
97.7 
25 
1. 0257 
27.9 
28.8 
121 
July 9 
July 25 
July 31 
Aug. 9 
Aug. 29 
34 
30 
88. 2 
43 
1. 0272 
27.6 
25.8 
139 
51 
54 
105.8 
25 
1. 0272 
27. 2 
26. 0 
151 
44 
62 
140.9 
24 
1. 0270 
27. 2 
26. 4 
161 
77 
75 
97. 4 
24 
1. 0274 
27. 4 
25. 6 
170 
44 
45 
102.3 
48 
1.0270 
25.7 
23.9 
43.7 
47.8 
112.0 
135 
1 PERCENT SOLUBLE 
FRACTION 
July 19 
July 27 
Aug. 2 
47 
58 
123.4 
22 
1. 0279 
1. 0275 
0. 0002 
2 
27.7 
28.9 
146 
30 
42 
116.6 
24 
1. 0274 
1.0281 
.0009 
5 
26.9 
27.3 
154 
54 
46 
85.2 
24 
1. 0273 
1.0274 
.0000 
21 
27.6 
27.0 
158 
Aug. 7 
Aug. 13 
54 
48 
88.8 
24 
1.0273 
1. 0275 
.0003 
17 
26. 1 
26.7 
164 
41 
28 
68.3 
24 
1. 0277 
1.0277 
. 0004 
25 
27.7 
28.0 
168 
Aug. 15 
Aug. 18 
58 
57 
98.3 
18 
1.0280 
1.0281 
.0002 
19 
28.4 
28. 1 
174 
83 
81 
97.6 
18 
1.0275 
1.0277 
.0004 
20 
28.7 
27.7 
53.3 
51.4 
90.9 
106. 
5 PERCENT SOLUBLE 
FRACTION 
June 21 
67 
71 
105. 9 
24 
1. 0259 
1. 0259 
.0002 
4 
27.4 
27.5 
107 
...do 
41 
33 
80.5 
24 
1. 0259 
1.0259 
.0002 
4 
27.2 
27.6 
138 
July 23 
July 26 
July 31 
Aug. 8 
Sept. 5 
46 
49 
106.5 
24 
1. 0273 
1. 0275 
.0003 
1 
26.8 
27. 4 
144 
36 
41 
113.9 
18 
1.0272 
1. 0279 
.0003 
4 
27.2 
28.0 
150 
46 
34 
73.9 
18 
1.0270 
1.0274 
. 0006 
16 
26.8 
26. 1 
157 
61 
49 
80.3 
18 
1.0273 
1. 0275 
.0003 
17 
26.8 
26.5 
182 _ 
38 
45 
118.4 
18 
1. 0231 
1. 0232 
.0003 
29 
25.5 
25.3 
47.8 
46.0 
97.0 
104. 
10 PERCENT SOLUBLE 
FRACTION 
June 20 
59 
35 
59.3 
18 
1.0258 
1.0259 
.0001 
27.5 
27.2 
105 
..do 
28 
16 
57. 1 
18 
1.0258 
1.0259 
.0001 
26.9 
26.8 
112.... 
June 26 
45 
44 
97.7 
14 
1.0259 
1.0259 
27.9 
27.0 
113 
...do 
62 
42 
67. 7 
12 
1. 0259 
1. 0259 
27.9 
27.6 
116 
June 27 
47 
44 
93.6 
18 
1. 0257 
1. 0259 
2 
28.0 
28.3 
117 
June 28 
40 
31 
77. 5 
24 
1.0249 
1. 0250 
28.2 
28.5 
170 
Aug. 15 
Aug. 30 
59 
50 
84.7 
24 
1.0280 
1.0281 
.0004 
19 
27.9 
27.4 
176 
39 
28 
71.8 
24 
1. 0269 
1. 0267 
.0007 
28 
23.0 
22.0 
47.4 
36.2 
76.2 
99.. 
20 PERCENT SOLUBLE 
FRACTION 
June 14 
47 
39 
83.0 
20 
1.0239 
1.0251 
.0004 
1 
25. 1 
26.4 
122 
July 9 
...do 
64 
42 
65.6 
18 
1. 0274 
1.0270 
.0004 
15 
27.6 
26.7 
123 
52 
10 
19.2 
18 
1.0274 
1.0270 
.0004 
15 
27.7 
27. 1 
137. 
July 23 
Aug. 13 
Aug. 17 
Aug. 29 
43 
13 
30.2 
24 
1. 0273 
1. 0275 
.0003 
1 
27.5 
25.8 
163 
36 
24 
66.6 
24 
1.0277 
1.0277 
.0002 
25 
28.2 
27.5 
175 
40 
13 
22.5 
18 
1. 0275 
1.0277 
.0004 
20 
28.6 
27. 4 
178 
41 
9 
21.9 
18 
1.0270 
1. 0267 
.0002 
22 
25.3 
20.4 
46. 1 
21.4 
45.6 
125. 
40 PERCENT SOLUBLE 
FRACTION 
July 12 
...do 
74 
22 
29.7 
24 
1. 0276 
1.0274 
16 
26.4 
27.9 
126. 
46 
21 
45.7 
18 
1. 0276 
1. 0274 
16 
26.5 
27.7 
129 
July 16 
July 25 
Aug. 2 
Aug. 13 
37 
13 
35. 1 
23 
1. 0275 
1. 0276 
.0003 
17 
28.4 
29.6 
142 
51 
26 
51.0 
12 
1.0272 
1. 0281 
.0005 
4 
26.7 
26.3 
153 
74 
41 
55.4 
24 
1.0273 
1.0274 
.0006 
16 
27.7 
27.6 
166 
52 
11 
21. 1 
18 
1.0277 
1. 0276 
.0003 
10 
27.7 
27.9 
55.7 
22.3 
39.7 
m 
50 PERCENT SOLUBLE 
FRACTION 
July 16 
Aug. 1 
Aug. 7 
Aug. 17 
Sept. 4 
58 
33 
56.8 
24 
1. 0275 
1. 0276 
.0003 
17 
28.5 
29. 1 
152 
58 
22 
37.9 
24 
1.0277 
1. 0275 
.0006 
21 
27.8 
26.3 
160 
112 
19 
16.9 
24 
1. 0273 
1. 0275 
.0002 
17 
27.3 
26.9 
173 
74 
15 
20.2 
18 
1.0275 
1. 0277 
.0004 
20 
28. 1 
26.9 
183 
34 
12 
35.3 
24 
1. 0230 
1. 0232 
.0003 
29 
24.9 
26. 1 
67.2 
20.2 
33.4 

