IOWA ACADEMY OF SCIENCE 
190 
TABLE I. 
Date 
Nitrite N in 
in 1,000,000 pts. 
of the water 
Nitrate N in 
1,000,000 pts. of 
the water 
Free Ammonia 
in 1.000,000 pts. 
of the water 
1 
Albuminoid am- 
monia in 1,000, - 
000 pts. of the 
1 water 
Chlorine parts 
per million 
Precipitation 
December 20 
0.23 
0.40 
. 
0.82 
0.51 
5 in. rain and snow 
December 25 
0.06 
0.22 
0.29 
0.15 
3 in. snow 
December 26 
0.08 
0.14 
0.058 
0.29 
4 in. snow 
December 30 
0.015 
0.14 
0.216 
0.16 
0.284 
4 in. snow 
January 9 
0.08 
0.32 
0.11 
0.16 
7.1 
3 in. snow 
January 13 
0.075 
0.28 
0.23 
0.30 
3.55 
4 in. snow 
February 1. 
0.03 
0.48 
0.33 
0.11 
0.71 
2 in. snow 
February 13 
0.09 
0.34 
0.36 
0.43 
3.55 
4 in. snow 
February 24 
0.06 
0.04 
0.56 
0.21 
1-10 in. rain and snow 
February 25 
Trace 
0.56 
1.64 
0.33 
2.13 
8 in. snow 
March. 2 
Trace 
0.72 
0.29 
0.29 
2.485 
6 in. snow 
March 11 
0.01 
0.40 
0.41 
0.30 
2.13 
4 in. snow 
March 14—1 
0.07 
0.84 
0.47 
0.36 
4.61 
3 in. snow 
March 14—11 
0.08 
0.76 
0.47 
0.36 
2.13 
4 in. snow 
March 20 
0.01 
0.44 
0.44 
0.23 
1.8 
10 in. snow 
April 13 
Trace 
0.12 
0.56 
0.23 
1.8 
J in. rain 
April 17—1 
0.01 
0.18 
0.47 
0.33 
4.26 
1 in. rain 
April 17—11 
0.02 
0.34 
0.52 
0.36 
2.84 
6 in. snow 
April 21 
Trace 
0.48 
0.41 
0.50 
| in. rain 
April 25 _ 
0.01 
1.00 
0.58 
0.70 
| in. rain 
April 28 
0.36 
0.88 
0.70 
0.66 
5.68 
| in. rain 
May 2 
Trace 
0.22 
0.67 
1 in. rain 
D 
Nitrite N in 
1,000,000 parts 
of the water 
Nitrate N in 
1,000,000 pts. 
water 
Free Ammonia 
in 1,000,000 
parts of the 
water 
Albuminoid Am- 
monia in 1,000, - 
000 parts of the 
water 
Chlorine parts in 
a million 
Precipitation 
May ih ___ 
0.25 
0.30 
0.81 
1 
0.51 
| in. rain 
May 11— T 
Trace 
0.32 
0.79 
0.68 
1 in. rain 
May 11— II 
0.052 
0.22 
0.84 
0.78 
J in. rain 
May 14 
0.38 
0.30 
0.85 
0.70 
i in. rain 
M ay 20 _ 
0.40 
0.60 
0.91 
0.78 
i in. rain 
May 21 
0.01 
0.44 
0.85 
0.80 
| in. rain 
