182 



PLANKTON OF WISCONSIN LAKES 



The number of centrifuge runs, the amount of water cen- 

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

 tained are indicated in this table. 



Lake 



Year 



Number 

 of Runs 



Volume 

 of Water 

 in Liters 



Nannoplankton 



Dry Weight 

 in Grams 



Milligrams 



per Cubic 



meter of 



Water 



Mendota 



1915 



1916 



1917 



Total 



1915 



1916 



Total 



1915 



1916 



Total 



65 



69 



11 



145 



8 

 13 

 21 



4 

 12 

 16 



88,953 



78,483 



12,670 



179,506 



9,777 

 12,510 

 22,287 



5,732 

 11,641 

 17,373 



212.417 

 296.430 

 45.858 

 554.705 

 43.659 

 55.156 

 98.815 

 36.002 

 62.423 

 98.425 



2,388 



Monona 



3,777 

 3,619 

 3,090 

 4,465 



Waubesa 



4,409 

 4,433 

 6,280 





5,362 

 5,665 



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. 



Number 



Quantity 



Dry Weight 



Number 



Quantity 



Dry Weight 



of 



of Water, 



of Plankton, 



of 



of Water, 



of Plankton, 



Sample 



Liters 



Milligrams 



Sample 



Liters 



Milligrams 



102 



1,925 



520 



125 



10 ,500 



4,450 



103 



2,200 



350 



126 



9,632 



5,130 



104 



3,060 



1,000 



128 



3,132 



1,550 



105 



3,645 



730 



129 



4,360 



2,240 



106 



2,570 



1,940 



130 



4,080 



2,505 



108 



7,860 



850 



131 



3,936 



1,627 



109 



6,777 



540 



202 



8,350 



850 



110 



7,112 



690 



204 



4,250 



868 



111 



8,400 



770 



205 



11 ,928 



5,914 



112 



10 ,980 



1,210 



207 



11,190 



7,102 



113 



10 ,314 



1,000 



208 



14 ,842 



5,632 



114 



2,640 



1,040 



209 



14 ,430 



4,293 



115 



12 ,457 



1,660 



212 



11 ,680 



1,672 



116 



12,579 



4,790 



213 



14,628 



2,610 



117 



12 ,432 



4,840 



214 



10,100 



4,236 



118 



8,322 



1,550 



215 



16,464 



3,226 



119 



10,500 



2,090 



218 



15 ,358 



4,661 



120 



3,215 



3,580 



219 



17 ,360 



6,459 



123 



10,535 



2,443 



220 



14,712 



10,258 



124 



4,284 



3,040 



221 



14,160 



7,872 



