A STUDY OF RELATIONS BETWEEN PLANT GROWTH. 



347 



A statement of the drainage conditions of this town will be instructive 

 at this place. Practically everj^ house in the town has connection to the sewer 

 system. These pipes pass to a large number of septic tanks which in turn 

 discharge into the lake within the limits of the line on the map. A very large 

 tank discharges into Pocanhontas Creek and its intermittent discharge is 



OA\,\e"t 



xY 1 n o n c5 



U.wxA* o^ Sew*o^e 



Fig. 10 — Map showing distribution of Plant Grrowth. 



responsible for the great variation in the analyses of the samples taken from 

 the station near the mouth of the creek. (Fig. 11) Relatively few tanks 

 discharge along the shore of the island made by the canal. During the summer 

 the town of Winona Lake has a large population, and the sewage is very 



