820 
BULLETIN OF THE BUREAU OF FISHERIES 
correction of —0.01 of pH, and a correction of +0.01 for every 1 per mille by which 
the salinity falls below 32 per mille, thus: 
Salinity, per mille 
29 
30 
31 
32-33 
34 
35 
Correction to pH 
+ 0 . 03 
+ 0 . 02 
+ 0 . 01 
0 
- 0 . 01 
- 0 . 02 
For use on shipboard, where conditions of light and shade are not always of the 
best, and where the lurching of the vessel may make it difficult to handle delicate 
apparatus, a dark comparator box, in which three tubes can be inserted — the sea 
water to be tested and a standard on either side of it — much facilitates the comparison 
of slight differences of color. We have made the following series of determinations 
from the Albatross and Halcyon. Accuracy can be expected to ±0.05 of pH, my 
experience corroborating Mayor’s (1922, p. 65) statement that differences as small 
as 0.03 pH can be detected with the particular colorimetric tubes employed. 
Albatross stations 
Station 
Date 
Depth 
pH 
corrected 
Salinity, 
per mille 
Temper- 
ature °C. 
42° 20' N. by 70° 40' W 
Mar. 10 
Surface 
7.9 
32. 00 
42° 17' N. by 70° 07' W 
do 
do 
7. 9 
32. 43 
2. 22 
42° 12' N. by 69° 06' W 
___do 
do 
7. 9 
32. 65 
2 22 
/Mar. 11 
do 
7.9 
32. 61 
3. 61 
«UUOo — - - 
i__do 
190 meters 
7. 88 
34.61 
4.63 
/..do 
Surface - 
7.9 
32.84 
3.5 
l— do 
330 meters 
7.98 
34. 78 
4. 02 
/..do 
Surface 
7.9 
32. 63 
3. 61 
*UUOO _ _ _ _ _ _ 
\-.do 
80 meters 
7.9 
32.69 
2.73 
/..do 
Surface 
7.9 
32. 57 
3. 33 
/..do 
70meters 
7.9 
32. 59 
3. 63 
(Mar. 12 
Surface 
7.9 
32. 68 
3. 05 
iiUUD / ________ _____ _______ 
\-.do 
90 meters 
7.9 
32. 79 
2.80 
(..do 
Surface 
7.9 
32. 65 
3. 33 
20068 _ 
■(..do .... 
150 meters 
7. 9 
33. 86 
4 40 
[..do 
190 meters 
7.89 
34. 23 
4.92 
/..do 
Surface 
7.9 
32. 83 
3. 33 
/..do 
1, 000 meters. 
7. 88 
34.92 
3. 77 
20073 
Mar. 17 
Surface ... 
7. 9 
32 44 
2 22 
20074 
/Mar. 19 
do 
7.9 
32.09 
1.39 
l..do 
150 meters 
7.9 
33. 69 
4. 68 
20075 
(..do .... 
Surface 
8 
31.80 
.56 
I-.do 
90 meters 
8 
33.21 
3. 76 
20078 
Mar. 20 
Surface 
8 
32 45 
1 Q5 
20079 
/Mar. 22 
do 
7.9 
32! 56 
2. 50 
\-_do 
200meters 
7.9 
33.31 
4. 29 
20082.. 
Mar. 23 
Surface 
7. 9 
32 59 
2 67 
20083 
do 
do 
7. 9 
32. 17 
1 95 
20085 
do __. 
7. 9 
2 50 
20087 
/ Mar. 24 
do 
7.9 
32. 49 
3. 05 
\-.do 
250 meters 
7.89 
34. 22 
5. 06 
20089 
Apr. 6 
7. 96 
31 25 
3 05 
20000 
/Apr. 9 
do 
7.9 
32. 36 
3. 33 
\..do 
120meters 
7.9 
32.48 
2.25 
20091 
Surface __ 
8 
31 Q7 
2 33 
20092 
7 94 
31 01 
3 05 
20095 
Apr. 10 
8 02 
30 07 
3 05 
20096 
8. 02 
9Q Q4 
2 78 
20098 
Apr. 11 
7. 95 
32 39 
3 05 
20099 
7. 99 
31 46 
3 61 
20103 
Apr. 15 
7. 9 
32 74 
3 89 
20104 
7 9 
32 32 
3 05 
20107 
7 9 
32 34 
3 33 
20108 
(..do.... 
do 
7.9 
32. 58 
4. 17 
U-do 
l30meters 
7.9 
33. 05 
3. 75 
20109 
I-.do 
Surface 
7.9 
32. 65 
4. 17 
i-.do 
150meters 
7. 88 
34. 54 
6. 47 
