8 PLANKTON OF WINNEBAGO AND GREEN LAKES. 



in Shawano, Forest, Oneida, and Langlade counties. The first 

 of these trips was made in September, the last three in the mid- 

 dle of August. To some of these lakes visits were made at 

 other times. Such collections, as intimated before, while giv- 

 ing a very imperfect idea of the f aunal and floral conditions of 

 these bodies of water, are yet very valuable as a matter of com- 

 parison. 



In this work the objects kept in view have been the following: 



1st. Lists of the fauna and flora. Inasmuch as the work 

 has been done entirely by one person, with the aid of an as- 

 sistant for a part of the time, and my exact systematic knowl- 

 edge is very largely confined to the entomostraca, it is not to 

 be expected that this list will be complete. It will, however, 

 serve to show such important differences as may exist between 

 the fauna and flora of Lake Winnebago, Green lake, and the 

 other lakes. 



2nd. A quantitative study of the plankton which should 

 give a clear idea of the annual variations, and of the quantita- 

 tive difference between the plankton of Lake Winnebago and 

 Green lake. 



3rd. A qualitative study of the plankton in order to deter- 

 mine the variations in its components in the course of the year. 



4th. It was hoped that the studies of the above topics would 

 furnish material for some exact additions to our knowledge of 

 the distribution of the animals and plants of the plankton, and 

 might help in the solution of the very complex problem of the 

 relation of the plankton to the fish. 



METHODS OF MAKING COLLECTIONS. 



In settling upon the methods which should be used in mak- 

 ing the collections, it was necessary to choose a method which 

 would be practicable in a permanent station, and yet which 

 should not involve so cumbersome apparatus that it could not 

 readily be carried from place to place without making too much 

 of a burden of weight. This latter consideration made the 

 pump impracticable. Moreover, I am inclined to agree with 



