(Contributions from the Zodtogical Laboratory oj Indiana University, No. 155.) 



Report on the Lakes of the Tippecanoe Basin 



(Indiana) 



By Will Scott, Ph.D., Assistant Professor of Zoology, Indiana University. 



Introduction 



The plan for the survey of the lakes of Indiana was formulated 

 and the work initiated in the -summer of 1912. The purpose of 

 this survey was to collect types of data known to be fundamental 

 in lake studies, and to undertake the investigation of specia.l 

 problems as they presented themselves in the course of the 

 generalstudies. 



The present paper presents the first section of the results 

 of this investigation. The work has been carried on from the 

 Indiana University Biological Station as a base. The lakes herein 

 described are drained by the Tippecanoe river. This river is 

 a northern tributary of the Wabash. Its drainage basin has an 

 area of 1,890 square miles. The following counties are drained 

 in part or wholly by the Tippecanoe river: Noble, Whitley, 

 Kosciusko, Marshall, Fulton, Starke, Pulaski, White, Cass, 

 Carroll, and Tippecanoe. 



The most fundamental fact about a lake is its contour, i.e. 

 its dimensions and form. These facts, plus its location and ele- 

 vation, determine its summer distribution of heat. 



The work of Birge and Juday (1911) on the Wisconsin lakes, 

 and that of Bronstedt and Wesenberg-Lund (1911) on the lakes 

 of Denmark, established the importance of dissolved oxygen, 

 carbon dioxide, and carbonates in the economy of lakes, and the 

 influence of thermal stratification upon their vertical distribution 

 and avaiijability. 



Consequently the plan has been to construct a hydrographic 

 map of each lake, to take the summer temperatures, and to 

 determine the amount and distribution of the dissolved oxygen, 

 carbon dioxide, and carbonates. In addition to this the plankton 



(3) ' 



