140 PLANKTON OF WISCONSIN LAKES 



trogen, and consequently of crude protein, than the averages for the 

 other lakes when the results are stated in terms of milligrams per cubic 

 meter of water. It will be noted that the amount of nitrogen is almost 

 ten times as large in this net sample from Lake Kegonsa as the average 

 for the various net catches of Lake Mendota and somewhat more than 

 twice as large as the average of Lake Waubesa. 



The percentage of ether extract is larger than the average for the 

 net material of Lake Waubesa, but lower than the averages of Lakes 

 Mendota and Monona. The percentage of pentosans is higher than the 

 average for Lake Mendota, but lower than the averages of the other 

 two lakes, while the order is reversed for the crude fiber. Owing to the 

 fact that the organic matter in the net catch from Lake Kegonsa is 

 much larger than the averages for the other lakes, the ether extract, 

 pentosans, and crude fiber are distinctly larger in this sample than the 

 averages for the other lakes when the results are given in terms of 

 milligrams per cubic meter of water. 



