194 



PLANKTON OF WISCONSIN LAKES 



Table 23. The amount of ash and silt in the nannoplankton of Lake 

 Mendota given in terms of milligrams per cubic meter of water. The 

 last part of the table shows four constituents of the ash stated in per- 

 centages of the dry weight of the nannoplankton. 











Ash of 







Fe 2 O s 







Number 





Total 



Bowl 



Nanno- 



Silt, 



SiO ? , 



+ 



CaO, 



MgO, 



of 



Date 



Ash, 



Ash, 



plankton 



Mg. 



Per 



A1 2 3 



Per 



Per 



Sample 





Mg. per 



Mg. 



Mg. per 



per 



Cent 



Per 



Cent 



Cent 







Cu.M. 



per 

 Cu.M. 



Cu. M. 



Cu.M. 





Cent 







529-31 



June 8-11, 1915 

 June 14-17 

 June 21-24 



926.6 

 964.7 



727.9 





216.0 

 192.3 

 123.0 



710.6 

 772.4 

 604.9 



19.50 

 20.91 

 24.51 









535-37 









541-45 



5.20 



4.5< 



1.59 



549-51 



June 28- July 1 

 July 6-9 



727.9 





133.4 



594.5 



21.92 









553-57 



921.6 





141.0 



780.6 



19.70 









561-65 



July 12-15 



822.6 





158.5 



664.1 



17.72 









567-75 



July 19-22 



1,260.8 





198.5 



1,062.3 



10.44 



3.80 



6.97 



1.47 



579-81 



July 26-29 

 August 2 



1,525.7 





176.7 



1,349.0 



6.35 









585 



1,404.0 





186.4 



1,217.6 



8.33 









589 



August 6 



1,342.6 





232.0 



1,110.6 



11.32 









595-100 



August 9-12 



678.2 





117.0 



561.2 



13.69 









5102-6 



August 16-19 

 August 23-26 



532.6 





105.0 



427.6 



13.38 









5110-12 



588.5 





123.0 



465.5 



25.58 



6.65 



5.76 



1.65 



5116-22 



Aug. 30-Sept. 2 

 September 7-9 

 June 12-16, 1916 



741.0 





154.2 



586.8 



17.04 









5124-26 



503.0 





133.4 



369.6 



14.71 









646-52 



1,371.0 



555.3 



117.0 



698.7 



21 . 7C 









654-56 



June 19-22 



1,577.7 



557.4 



164.6 



855.7 



18.49 



6.97 



8.1c 



5.17 



668-74 



July 5-7 



1,696.2 



554.0 



248.1 



894.1 



11.41 



5.77 



13. 76 



5.12 



688-92 



July 24-28 



1,767.8 



555.6 



204.0 



1 ,008 . 2 



8.25 





18 . 1£ 





694-98 



July 31-Aug. 3 



1,466.9 



556.0 



174.0 



736.9 



7.36 



6.i4 



19.44 



6.2i 



6100-6 



August 7-9 

 August 14-18 



1,454.7 



649 . 3 



138.3 



667.1 



10.19 









6108-12 



1,320.6 



566.0 



161.4 



593.2 



9.53 



7.55 



10. 0£ 



6.25 



6114-18 



August 22-25 

 August 28-31 

 Jan. 18, 1917 



1,297.0 



556 . 7 



130.3 



610.0 



12.22 









6120-24 



1,269.0 



550.0 



124.2 



594 . 8 



11.43 









702 



1,155.6 



761.6 



158.5 



235.5 



5.90 



5.80 



11.66 



9.35 



706 



March 9 



942.5 



720.0 



111.0 



112.5 



6.00 



3.72 



15. 2C 



11.72 



