122 



PROBLEMS OF LAKE BIOLOGY 



JuDAY, C. 1934. The Depth Distribution of Some 



Aquatic Plants. Ecology, 15: 325. 

 Klugh, a. B. 1926. The Productivity of Lakes. 



Quart. Beview Biol., 1: 572. 

 LoHAMMAR, G. 1938. Wasserchemie und hoher 



Vegetation Schwedischer Seen. Symholae Bo- 



tanicae TJpsaUenses, 3: 1. 

 Magnin, M. Ant. 1893. Vegetation des Lacs des 



Jura. Eev. Gen. de Bot., 5: 240, 303. 

 McAtee, W. L. 1917. Propagation of Wild-duck 



Foods. Bull. U. S. Dept. Agric, No. 465. 

 MuTTKOWSKi, R. A. 1918. The Fauna of Lake 



Mendota. A Qualitative and Quantitative Study 



Avith Special Reference to the Insects. Trans. 



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 Pearsall, W. H. 1918. On the Classification of 

 ^ Aquatic Plant Communities. J. of Ecol., 6: 75. 

 . 1920. The Aquatic Vegetation of the 



English Lakes. J. Ecol., 8 : 163. 



-. 1921. The Development of Vegetation 



in the English Lakes, Considered in Relation to 

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1929. Dynamic Factors Affecting 



Aquatic Vegetation. Proc. Internat. Cong. Plant 

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Pearsall, W. H. and Hanby, A. M. 1925. The 

 Variation of Leaf Form in Potamogeton per- 

 foliatus. New Phytol., 24: 112. 



Pearsall, W. H. and Hewitt, T. 1933. Light 

 Penetration into Fresh Water. II. Light Pene- 

 tration and Changes in Vegetation Limits in 

 Windermere. J. Exper. Biol., 10: 306. 



and W. H. Pearsall. 1923. Potamoge- 

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Pearsall, W. H. and Ullyott, P. 1934. Light 

 Penetration into Fresh Water. III. Seasonal 

 Variations in the Light Conditions in Windermere 

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 89. 



Pond, R. H. 1905. Relation of Aquatic Plants to 

 the Substratum. U. S. Comm. of Fish and Fish- 

 eries, Bep. of the Comm., 39 : 483. 



Reighard, J. 1915. An Ecological Reconnaissance 

 of the Fishes of Douglas Lake, Michigan, in Mid- 

 summer. Bull. U. S. Bur. Fish., Vol. 33. 



RiCKETT, H. W. 1922. A Quantitative Study of 

 the Larger Aquatic Plants of Lake Mendota. 

 Trans. Wis. Acad. Sci., 20: 501. 



. 1924. A Quantitative Study of the 



Larger Aquatic Plants of Green Lake, Wiscon- 

 sin. Trans. Wis. Acad. Sci., 21: 381. 



Steenis, J. H. 1932. Lakes of Sawyer County. 

 Bull. Wis. Dept. Agric. and Marhets, No. 138, 53. 



. 1933. Lakes of Douglas County. Bidl. 



Wis. Dept. Agric. and Marhets, No. 146, 56. 



1934. Lakes of Langlade County. Ex- 



tension Serv. College of Agric, Univ. of Wis. 

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1935. Lakes of Rusk County. Land 



Econ. Invent, of the State of Wis., No. 2, 32. 

 Veatch, J. C. 1931. Classification of Water Soils 



is Proposed. Quart. Bull. Mich. Agr. Exper., 



14: 1. 

 . 1933. Some Relationships Between 



Water Plants and Water Soils in Michigan. 



Papers Mich. Acad. Sci., 17: 409. 

 Warming, Eng. 1925. Oiscology of Plants. Ox- 

 ford Univ. Press. 

 Wilson, C. B. 1924. Water Beetles in Relation to 



Pondfish Culture. Bull. U. S. Bur. Fish., Vol. 39. 

 Wilson, L. R. 1935. Lake Development and Plant 



Succession in Vilas County, Wisconsin. Part I. 



The Medium Hard Water Lakes. Ecol. Mono., 



5: 207. 

 ■ — . 1937. A Quantitative and Ecological 



Study of the Larger Aquatic Plants of Sweeney 



Lake, Oneida County, Wisconsin. Bull. Torr. 



Bot. Club, 64: 199. 



