182 



PLANKTON OF WISCONSIN LAKES 



Table 3. The nwmher of centrifuge runs, the amount of water cen- 

 trifuged in th& different years, and the quantity of dry material ob- 

 tained are indicated in this table. 



Table 4. The quantity of water, in liters, used for the various sam- 

 ples of net plankton and nannoplankton are given in this table as well 

 as the dry weight of the plankton obtained therefrom. The quantita- 

 tive results given in tables 43 to 48 are based upon the amounts indi- 

 cated in this table; those samples secured in July, August, and Septem- 

 ber were subject to correction as indicated on page 24. In the series of 

 sample numbers the first figure indicates the year in which the sample 

 was taken; 102 for example, represents the second sample obtained in 

 1911, 215 the fifteenth sample of 1912, and so on. 



