175 
PLANKTON PRODUCTION AN FISH PONDS 
Table 10 .- — Data on carbon dioxide, dissolved oxygen, chloride, phosphorus, nitrogen, and organic 
matter in milligrams per liter in 1927. Temperatures in degrees centigrade, turbidity in inches, net 
plankton in cubic centimeters per 10 liters of water. Also pH values — Continued 
POND D 9 
Date 
Tem- 
pera- 
ture 
Turbid- 
ity 
Oa 
pH 
COa 
free 
Chlo- 
ride 
Phosphorus 
Nitrogen 
Or- 
ganic 
matter 
Net 
plank- 
ton 
Total 
Dis- 
solved 
Or- 
ganic 
Nila 
NOa 
NOa 
Or- 
ganic 
May 9 
17.2 
24 
7.89 
8.2 
-2. 02 
4.0 
0.095 
0. 023 
0. 072 
0.032 
0. 120 
Nil. 
0. 632 
5. 0 
0. 15 
May 19 
13.3 
22 
0.81 
8.2 
5. 06 
2.0 
.058 
.048 
.010 
. 052 
.000 
Nil. 
.900 
4. 44 
.05 
May 29 
13.9 
12 
9. 47 
8.7 
-10. 12 
4.0 
.038 
Nil. 
.038 
.060 
.060 
Nil. 
3. 920 
4. 76 
.60 
June 9 
18.3 
6 
7. 96 
9.0 
-30. 34 
3.0 
.095 
Trace. 
.095 
. 016 
.030 
Nil. 
2. 760 
20. 24 
.65 
24.4 
12 
6. 26 
8.3 
4. 54 
4.0 
.028 
.018 
. 010 
.044 
.045 
Nil. 
7. 02 
. 19 
June 30 
27.2 
24 
3.63 
8.4 
5. 06 
3.0 
. 195 
.048 
. 147 
.048 
.030 
Nil. 
1. 120 
8. 57 
.29 
July 10 
23.9 
24 
2. 17 
7.7 
12. 04 
3.0 
. 175 
.029 
. 146 
.224 
.040 
Nil. 
.776 
1. 30 
.08 
July 20 
21.7 
40 
5. 16 
7.8 
9.78 
2. 0 
. 195 
. 029 
. 106 
. 040 
.030 
Nil. 
1,472 
1. 57 
.52 
July 28. . 
27. 2 
Bottom. 
5. 66 
3. 54 
2.5 
.095 
.033 
.062 
.080 
. 060 
Nil. 
.864 
2. 30 
.70 
Aug. 8 
25.5 
Bottom. 
6. 22 
9. 1 
- 10. 10 
2.0 
.048 
.038 
.010 
.064 
.020 
Nil. 
.920 
1.24 
.22 
Aug. 18 
19.4 
Bottom. 
5. 76 
8.2 
5. 06 
2.5 
.038 
.019 
.019 
.032 
. 015 
Nil. 
.760 
1. 45 
.92 
Aug. 29 
22.2 
40 
11.34 
9.0 
-3. 42 
1.5 
.063 
.018 
.045 
.052 
.015 
Nil. 
. 169 
1. 19 
. 12 
Sept. 8 
22.8 
Bottom. 
6. 75 
8.9 
-13. 16 
1.5 
.043 
.033 
.010 
.016 
.035 
Nil. 
.400 
1.28 
. 15 
Sept. 19 
15.5 
Bottom. 
7. 06 
8.5 
-3.04 
2.5 
.295 
. 090 
. 205 
. 032 
.025 
Nil. 
.760 
1.09 
.20 
Sept. 29 
11. 1 
Bottom. 
9. 75 
8.9 
-28. 32 
1.5 
. 180 
.090 
.090 
.036 
.033 
Nil. 
.460 
1. 52 
.60 
1 
I 
.055 
.041 
1.136 
4. 13 
. 36 
Note.— A negative value for free CO2 means a phenolphthalein alkalinity. 
LITERATURE CITED 
Allen, E. J., and E. W. Nelson. 
1910. On The Artificial Culture of Marine Plankton Organisms. Journal, Marine Biological 
Association of the United Kingdom, new series, Vol. VIII, No. 5, March, 1910, pp. 
421-474, 1 text fig. Plymouth, England. 
American Public Health Association. 
1923. Standard Methods for the Examination of Water and Sewage. 5th edition, 1923, 111 p. 
Boston. 
Atkins, W. R. G. 
1923. The Phosphate Content of Fresh and Salt Waters in Its Relationship to the Growth of 
the Algal Plankton. Journal, Marine Biological Association of the United Kingdom, 
new series, Vol. XIII, No. 1, December, 1923, pp. 119-150, 8 text figs. Plymouth, 
England. 
1925. Seasonal Changes in the Phosphate Content of Sea Water in Relation to the Growth of 
the Algal Plankton during 1923 and 1924. Ibid., part 3, March, 1925, pp. 700-720, 
8 text figs. Plymouth, England. 
1926. The Phosphate Content of Sea Water in Relation to the Growth of Algie Plankton. Ibid., 
Vol. XIV, No. 2, 1926-27, pp. 447-467, 5 figs. Plymouth, England. 
Atkins, W. R. G., and G. T. Harris. 
1924. Seasonal Changes in the Water and Heleoplankton of Fresh Water Ponds. Proceedings, 
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Birge, Edward A., and Chancey Juday. 
1911. The Inland Lakes of Wisconsin. The Dissolved Gases of the Water and Their Biological 
Significance. Bulletin, Wisconsin Geological and Natural History Survey, No. XXII, 
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cal Society, Vol. LXVI, 1927, pp. 357-372. Philadelphia. 
Brandt, K. 
1919. Ueber den Stoffwechsel im Meere. Wissenschaftliche Meeresuntersuchungen, vol. 18, 
No. 3, 1919, pp. 187-429. Kiel and Leipzig. 
Denig&s, G. 
1921. Determination quantitative des plus faibles quantity de phosphates dans les produits 
biologiques par la methode c4ruleomolybdique. Comptes Rendus Societe Biologique, 
vol. 84, No. 17, pp. 875-877. Also Comptes Rendus Academie des Science, vol. 171, 
pp. 802-920. Paris. 
