488 Wisconsin Academy of Sciences, Arts, and Letters. 
Table 7. The number of the three sizes of Chironomus larvae noted 
at the five deep-water stations during the different months of the year. 
With the exception of January and February1917, the figures for each 
month represent averages per square meter ,of three to twenty-three 
samples. 
Table 8. The average weight in milligrams of a single individual of 
the three different sizes of Chironomus larvae, together with the percent¬ 
ages of water and of ash. 
Size 
Live Weight, 
Milligrams' 
Dry Weight, 
Milligrams 
Percentage 
of Water 
Percentage 
o f Ash 
Large .... 
57.0 
8.89 
84.4 
4.49 
Medium .. 
12.6 
2.04 
83.9 
4.02 
Small ................. —..... 
2.5 
0.47 
81.5 
3.58 
Table 9. The live weight and dry weight of Chironomus larvae per 
unit area of bottom. 
Size 
Number 
per 
Hectare 
Live Weight 
Dry Weight 
filograms 
per 
Hectare 
Pounds 
per 
Acre 
Kilograms 
per 
Hectare 
Pounds 
per 
Acre 
Large ... 
770', 900 
43.9 
39.2 
6.8 
6.1 
Medium ... 
1,838,300 
23.2 
20.7 
3.8 
3.3 
Small .................... 
3,320,800 
8.3 
7.4 
1.6 
1.4 
Totals....... 
5,930,000 
75.4 
67.3 
12.2 
10.8 
