4 



Indiana University Studies 



was collected at critical levels. The particular glacial process 

 which caused each lake has been determined whenever possible. 

 Many of the lakes have been changed by drainage while others 

 have been dammed. These facts and their influences have been 

 noted and are briefly discussed in this paper. Part of these latter 

 observations have been pubhshed (Scott, 1913). 



Hydrographic maps have been constructed of the following 

 lakes: Manitou, Beaver Dam, Yellow Creek, Palestine, Silver, 

 Plew, Sawmill, Irish, Kuhn, Little Eagle (Chapman), Hammon 

 (Big Barbee), Dan Kuhn, and Ridinger. The soundings for these 

 maps have been recorded in meters and the contours drawn at 

 two-meter intervals. 



Previous to this survey, hydrographic maps of several lakes 

 in this basin have been constructed. Some of these maps are 

 inaccurate in places and the soundings are expressed in feet. 

 However, it has been deemed advisable to map other lakes 

 rather than correct these until more time and money are available. 

 The lakes that have been so mapped are Webster, Tippecanoe, 

 Pike, Center, and Eagle (Winona). In this list mention should 

 be made of the map of Turkey lake, which, however, lies in the 

 St. Joseph basin. For complete reference to these maps see the 

 appended bibliography. 



Gas determinations, temperature records, and collections of 

 plankton have been made in the following lakes: Manitou, 

 Yellow Creek, Center, Pike, Eagle (Winona), Little Eagle (Chap- 

 man), Tippecanoe, Plew, and Hammon (Big Barbee). 



To avoid duplication, no work has been done on Lake Maxin- 

 kuckee. Various investigators of the United States Bureau of 

 Fisheries have been studying this lake since 1899. An excellent 

 map, unfortunately in English units, has been published by this 

 Bureau. Juday (1911) has published a series of temperature and 

 gas determinations from this lake. Except the descriptioas of 

 two new fish, no other publication of this work has appeared. 



While the general survey has progressed thus far, the following 

 special studies have been completed or are nearing completion: 

 The Food and Feeding Habits of the Fresh-water Mussels, by W. R. 

 Allen; The Food of the Daphnids, by H. G. Fisher; The Food of 

 the Young Fishes of Winona Lake, by R. Enochs; The Fauna of 

 the Oxygenless Region of Center Lake, by H. G. Imel; The 

 Relation of the Nitrogen Compounds to the Production of the 

 Various Littoral Associations in Winona Lake, by T. B. Rice. 

 The first three of these are parts of the large problem of the food 



