APPENDIX 



199 



Table 32. Variations in the percentage and in the quantity of ether 

 extract in the net plankton of Lake Monona. Compare with the net 

 plankton of Lake Mendota, table 10. 



Year 



Number 



of 

 Analyses 



Per Cent, Ash Free 



Milligrams per Cubic Meter 

 of Water 



Maximum 



Minimum 



Mean 



Maximum 



Minimum 



Mean 



1911 

 1912 

 1913 

 1915 

 1916 



4 

 6 

 16 

 7 

 2 



10.57 

 8.81 

 9.61 

 7.95 



11.16 



5.30 

 3.12 

 2.79 

 4.20 

 8.09 



7.95 

 4.77 

 5.62 

 6.38 

 10.15 



41.3 

 156.4 

 143.4 

 171.8 

 142.2 



12.6 

 18.8 

 13.3 

 37.2 

 69.0 



27.5 

 64.2 

 47.2 

 98.8 

 105.6 



Table 33. A summary of the variations in the percentages of ash 

 and of silica in the net plankton of Lake Monona. Compare with Lake 

 Mendota, table 14. 

















Difference 







Per Cent of Ash 



Per Cent of Silica 



between 





Number 

 of 













Means of 

 Ash and 



Year 



Maxi- 



Mini- 



Mean 



Maxi- 



Mini- 



Mean 





Analyses 



mum 



mum 





mum 



mum 





Silica 



1911 



4 



13.55 



5.32 



8.10 



2.67 



0.77 



1.86 



6.24 



1912 



6 



20.46 



5.15 



10.75 



13.82 



1.15 



4.96 



5.79 



1913 



16 



31.14 



2.28 



12.12 



21.70 



0.12 



3.82 



8.30 



1915 



8 



19.82 



8.40 



14.00 



14.17 



1.47 



5.06 



8.94 



1916 



13 



33.19 



9.76 



21.61 



27.05 



1.27 



8.30 



13.31 



Table 34. The range of the variations in the percentage and in the 

 amount of nitrogen in the nannoplankton of Lake Monona. Compare 

 with the net plankton, table 30, and with the nannoplankton of Lake 

 Mendota, table 18. 



Year 



Number 

 of 



Analyses 



Per( 



Dent, Ash F 



ree 



MiUigran 



is per Cubic Meter 

 of Water 



Maximum 



Minimum 



Mean 



Maximum 



Minimum 



Mean 



1915 

 1916 



8 

 13 



11.28 

 10.08 



5.92 

 3.58 



10.10 

 8.21 



412.5 

 574.2 



44.1 

 35.4 



236.2 

 193.3 



Table 35. The range of the variations in the percentage and in the 

 amount of crude protein in the nannoplankton of Lake Monona. These 

 results are based on those given in table 34. Compare with the net 

 plankton, table 31, and with the nannoplankton of Lake Mendota, table 

 19. 



Year 



Number 



of 

 Samples 



1915 

 1916 



8 

 13 



Per Cent, Ash Free 



Maximum Minimum 



70. 

 63. 



37.0 

 22.4 



Mean 



63.1 

 51.3 



Milligrams per Cubic Meter 

 of Water 



Maximum Minimum Mean 



2,578.1 



3,588.8 



275.6 

 221.2 



1,476.5 

 1,208.2 



