188 



PLANKTON OF WISCONSIN LAKES 



Table 8. The maximum, minimum, and mean percentages and 

 amounts of crude protein in the organic matter of the net plankton 

 of Lake Mendota. This table is based on the second part of table 7. 

 Crude protein equals N X 6.25. 



Table 9. The percentages of four forms of nitrogen found by Schu- 

 ette in some net plankton from Lake Mendota. (Trans. Wis. Acad. Sci., 

 Arts, and Let., Vol. XIX, 1918, p. 604.) 



Table 10. The variations in the percentage and in the quantity of 

 ether extract in the net plankton of Lake Mendota are shown in this 

 table. 



