Schuette and Hoffman—Aquatic Plants of Lake Mendota. 531 
SUMMARY OF ANALYSES 
Constituent 
Cladophora 
M'yriophyllum 
Ash .... —.. 
26.53% 
20.72% 
Crude protein (N x 6.25). 
18.19 
18.75 
Ether extract ... 
2.00 
2.44 
Crude fiber ... 
17.33 
15.01 
Pentosans ..... 
9.10 
7.70 
Nitrogen-free extract . 
26.85 
35.38 
Analysis of the ash of these two plants gave the following re¬ 
sults, which are stated in percentage of the air-dry weight of the 
original sample. 
COMPOSITION OF THE ASH 
Constituent 
Cladophora 
Myriophyllum 
Silica (SiO'2) ...... 
7.08% 
0.14 
1.96% 
1.62 
Chlorides (Cl) ........ 
Sulphates (SOU) .. 
0.64 
1.36 
P'hnsphnme pentrwridA (FoCO. 
0.32 
1.17 
Iron oxide (Fe20'3). 
0.49 
0.08 
Aluminum oxide (ALO'a). 
1.30 
4.25 
Manganese oxirle (MnaOu.1 . 
0.75 
trace 
Calcium rvxirie (Cad. 
3.25 
4.28 
Magnesium oxide (MgO).. 
1.62 
1.34 
Sndinm mririe (NaoO 1 ) . 
not determined 
not determined 
Potassium oxide (K2O). 
not determined 
not determined 
