447 
NITROGEN, ETC., IN Mvp or Intinois ValLtey LAKres, May—OctToser, 1914 
SAMPLES FROM MIDDLE, IN DEEPEST WATER 
PER CENT. IN TERMS OF DRY MATTER 
5 Organic 
Lake Samples | Nitrogen eee pan 
iL Clear—Mud 2 0.23 2.93 
Deeper 
bottom-land 
lakes) Liverpool 1 0.29 2.52 
Thompson +4 0.32 4.83 
Dogfish ul 0.30 3.46 
Sangamon 5 0.22 4.86 
Average (5 lake 
averages) oe 0.27 : 3.72 
II. Quiver 4 0.32 3.46 
Deeper 
sand-beach 
lakes Matanzas 1 0.24 2.73 
Average (2 lake 0.28 3.09 
averages) ea ; : 
III. Flag 1 0.52 5.48 
Shallow, 
weedy 
: lakes Seebs 1 0.35 3.78 
Stewart 1 0.31 3.66 
Average ae 0.39 4.30 
IV. 
Very shallow, 
very weedy Crane 1 0.26 i) 
lakes 
| 
General average....... 0.32 3.89 
