go forward. Great sections of our country are relatively unexplored in this respect. We need to know what is there, and furthermore we need to know what plants are present in our lakes at all times of the year. It is unfortunate that so many ecological and taxonomic studies are based on summer collections only. If we are to re-classify our lakes in respect to their limnological characteristics, and attempt a classification in respect to their phytoplankton types, then our familiarity with species must be maintained and we must have expert advice on the definition and the listing of species. Before sound ecological generalizations can be made we must have more data on the occurrence of algal species.

In this connection the writer wishes to suggest that when phytoplankton species are reported from various parts of our country, that herbarium records be kept. This is becoming increasingly more important. If possible, herbarium material should be placed in a number of central museums where they may be more available for the students of algal taxonomy and ecology. Taxonomy is of basic importance and should be maintained on the same scientific level as are the other sciences. Therefore, the work of the taxonomist should be conducted in such a way that it may be repeated and confirmed.


ALLEN W. E. 1920. A Quantitative and Statistical Study of the Plankton of the San Juan River and its Tributaries in and Near Stockton, California, in 1893. Univ. Calif. Publ. Zool., 22: 1.

ATKINS W. R. G. 1923. The Phosphate Content of Fresh and Salt Water in Its Relationship to the Growth of the Algal Plankton. J. Marine Biol. Ass., 13: 119.

ATKINS W. R. G. and HARRIS G. T. 1924. Seasonal Changes in the Water and Heleoplankton of Fresh Water Ponds. Sci. Proc. Boy. Dublin Soc., 18: 1.

BIGELOW N. K. 1923. Plankton Studies of Lake Nipigon and Environs. Univ. Toronto Studies, Publ. Ontario Fish. Research Lab., 13: 41.

BOND R. M. 1933. Contribution to the Study of the Natural Food-cycle in Aquatic Environments. Bull. Bingham Oceanographic Collection, 4: 1.

CHAMBERS CHAS. O. 1912. The Relation of Algae to Dissolved Oxygen and Carbon-dioxide. With Special Reference to Carbonates. 23rd Ann. Rept. Missouri Bot. Garden, 171.

CHANDLER DAVID C. 1937. The Fate of Typical Lake Plankton in Streams. Ecol. Monogr., 7: 447.

CLARKE GEO. L. and GILLIS S. S. 1935. The Nutrition of Copepods in Relation to the Foodcycle of the Sea. Biol. Bull., 68: 231.

COYLE ELIZABETH. 1930. The Algal Food of Pimephales promelas. Ohio. J. Sci., 30: 23.

DE JAMES H. B GRUCHY. 1938. A Preliminary Study of the Larger Aquatic Plants of Oklahoma with Special Reference to Their Value in Fish Culture. Oklahoma Agri. and Mech. College, Agri. Exper. Station, Tech. Bull., No. 4: 1.

EDDY SAMUEL E. 1934. A Study of Fresh-water Plankton Communities. Ill. Biol. Monogr., 12, No. 4.

FITCH C. P. et al. 1934. "Water Bloom" as a Cause of Poisoning in Domestic Animals. Cornell Veterinarian, 24, No. 1: 31.

FRITSCH F. E. 1931. Some Aspects of the Ecology of Freshwater Algae (with Special Reference to Static Waters). J. Ecol., 19: 233.

FROHNE W. CARRINGTON. 1938. Contribution to our Knowledge of the Limnological Role of the Higher Aquatic Plants. Trans. Am. Microse. Soc., 57, No. 3, 256.

GRIFFITHS B. M. 1936. The Limnology of the Long Pool, Buttery Marsh, Durham; etc. J. Linn. Soc. Bot., 50: 393.

HARVEY H. W. 1926. Nitrate in the Sea Water. J. Marine Biol. Assoc., 14: 71.

HUBER-PESTALOZZI G. 1938. Die Binnengewässer. Band XVI, Das Phytoplankton des Süsswassers. Stuttgart.

HUFF N. L. 1923. Observations on the Relation of Algae to Certain Aquatic Animals of Vadnais Lake. Univ. Minn. Stud. Biol. Sci., 4: 185.

HUTCHINSON G. EVELYN, PICKFORD E. and GRACE E . 1932. Limnological Observations in Mountain Lake, Virginia. Int. Rev. d. Ges. II ydrob u. Hydrogr., 27: 252.

JUDAY C. and BIRGE E. A. 1931. A Second Report on the Phosphorus Content of Wisconsin Lake Waters. Trans. Wis. Acad. Sci., 26: 353.

-----. 1933. The Transparency, the Color and the Specific Conductance of the Lake Waters of Northeastern Wisconsin. Trans. Wis. Acad. Sci., 28: 205.

JUDAY C., BIRGE E. A. and MELOCHE V. W. 1938. Mineral Content of the Lake Waters of Northeastern Wisconsin. Wis. Acad. Sci., 31: 223.

KLUGH A. B. 1926. The Productivity of Lakes. Quart. Rev. Biol., 1: 572.

KRAATZ W. C. 1928. Study of the Food of the Blunt-nosed Minnow, Pimephales notatus. Ohio J. Sci., 28: 86.

KOFOID C. A. 1908. The Plankton of the Illinois River, 1894-1899, with Introductory Notes Upon the Hydrography of the Illinois River and Its Basin. Part II. Constituent Organisms and Their Seasonal Distribution. Bull. Ill. State Lab. Nat. Hist., 8: 1.

KROGH AUGUST. 1931. Dissolved Substances as Food of Aquatic Organisms. Biol. Rev. and Biol. Proc., Cambridge Phil. Soc., 6: 412.


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Problems of Lake Biology


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