THE PLANKTON OF LAKE WINNEBAGO 

 AND GKEEN LAKE. 



CHAPTER I. 



OUTLINE OF STUDY. 



The attempt in this investigation has been to make a com- 

 parative study of the plankton of two lakes of different types, 

 with a collateral study of such other lakes as could be easily 

 reached. 



It was thought that if , after a somewhat careful preliminary 

 study, the plankton of the two lakes could be kept under observa- 

 tion for a considerable period of time, many facts in regard to 

 the annual and geographical distribution of the animals and 

 plants could be secured, and perhaps some generalizations could 

 be reached in regard to the principles controlling such distribu- 

 tion. 



LAKE WINNEBAGO AND GREEN LAKE. 



Lake Winnebago was chosen for the type of the shallow lake 

 mainly because of its importance from the standpoint of the pro- 

 duction of fish. It is known to be an enormously productive 

 body of water, and the fishing industry has employed a great 

 many men in Oshkosh. letting has been forbidden by legisla- 

 tive enactment for several years, and, in spite of many infrac- 

 tions of the law, it is generally acknowledged among all but inter- 

 ested parties, that the number of fish has greatly increased in 



