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Notes on Parasitic Fungi in Wisconsin, VIII. (With three 
Figures.) J. J. Davis. ... 413 
Experimental Work on the Relation of Soil Temperature to 
Disease in Plants. (With Plates XXXIII-XXXVII, 
and four Figures.) L. R. Jones . 433 
Quantitative Studies of the Bottom Fauna in the Deeper 
Water of Lake Mendota. (With one Figure.) Chan- 
cey Juday . 461 
A Survey of the Larger Aquatic Plants of Lake Mendota. 
(With one Figure). R. H. Denniston . 495 
A Quantitative Study of the Larger Aquatic Plants of Lake 
Mendota. (With Plate XXXVIII.) H. W. Rickett 501 
Notes on the Chemical Composition of Some of the Larger 
Aquatic Plants of Lake Mendota. I. Cladophora and 
Myriophyllum. Henry A. Schuette and Alice E. 
Hoffman . 529 
A Second Report on Limnological Apparatus. (With 
Plates XXXIX-XL, and five Figures.) Edward A. 
Birge . 533 
The Rotifers of Wisconsin. (With Plates XLI-LXI, and 
four Figures.) H. K. Harring and F. J. Myers . 553 
Thure Kumlien (With Plates LXII-LXIV.) Publius V. 
Lawson . 663 
Proceedings of the Academy, 1919 and 1920. 687 
Programme of the Exercises in Commemoration of the 
Fiftieth Anniversary of the Academy. 693 
The Academy Medallion, 187CL1920 (With Plate LXV) 
Edward A. Birge . 711 
List of Officers and Members. 717 
Charter of the Academy. 751 
Constitution of the Academy. 754 
General Index of Volumes I-XX. 759 
