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203 



FIRST REPORT OF THE BIOLOGICAL STATION. 



Contents. — Directors' First Keport of Biological Station. 



Introductory. 



Acknowledgments. 



Equipment. 



Plankton net. 



Sounding apparatus. 



Additional equipment. 



Plan of work. 

 Part I.— Turkey Lake as a Unit of En^'ironment. 



Introductory. 



Orientation. 



General features. 



Size. 



Relation of water to outflow and evaporation. 



Constancy of Turkey Lake as a unit of environment. 



A Preliminary Report on the Physical Features of Turkey Lake — D. C. 

 Ridgley. 



Hydrographic map of Turkey Lake — C. .Juday. 



Temperature of Turkey Lake — J. P. Dolan. 

 Part XL — The Inhabitants of Torkey Lake. 



Note on Plankton — C. H. Eigenmann. 



General Fauna — C. H. Eigenmann. 



Leeches — Mrs. B. C. Ridgley. 



Rotifera— D. S. Kellicott. 



Cladocera — E. A. Birge. 



Decapoda — W. P. Hay. 



Mollusca -R. E. Call. 



Fishes — C. H. Eigenmann. 



Batrachia — C. Atkinson. 



Snakes — G. Reddick. 



Turtles— C. H. Eigenmann. . 



Water Birds — F. M. Chamberlain. 



Part III. — Variation. 



The study of Variation — C. H. Eigenmann. 

 Variation of Etheostoma caprodes — W. J. Moenkhaus 



