MICHIGAN ACADEMY OF SCIENCE. 
115 
TABLE III. 
Waters from the Great Lakes. 
Ammonia. 
Place. 
No. 
sample. 
Cl. 
No. of 
Germs. 
Effect on 
animals. 
Free. 
Alb. 
3 
.310 
.226 
6.5 
410 
34- 
3 
.235 
.513 
403.3 
400 
24- 
6 
.012 
.047 
14.8 
18 
2+ 
32 
.049 
.084 
12.8 
19,330 
64- 
15 
.035 
.092 
4.3 
44- 
1 
.040 
.030 
5 
14- 
2 
.110 
.070 
95 
14- 
80 
.020 
.050 
6 
5,692 
44- 
4 
.078 
.161 
8.6 
1,600 
24- 
8 
.033 
.056 
3.8 
944 
3+ 
7 
.006 
0.20 
8 
40 
44- 
11 
.074 
.068 
4.5 
16,280 
24- 
5 
.050 
.066 
10 
12,152 
24- 
3 
.011 
.228 
27.5 
3,090 
34- 
1 
.020 
.012 
6.6 
840,000 
181 
.040 
.076 
15.3 
12,067 
39+ 
STREAMS. 
Table IV gives the examinations of waters taken from rivers and 
smaller streams. Some of these constantly contain the colon bacillus 
and consequently kill animals. This will be seen to be true of the river 
waters from Alma and Adrian. Every sample of water from the stream 
supplying Adrian has killed animals, even after filtration. The patho¬ 
genic organism invariably found is the colon bacillus, and there have 
been no epidemics of typhoid at Adrian. This is quite convincing evi¬ 
dence that the colon bacillus does not cause typhoid. 
TABLE IV. 
Streams and Rivers. 
Ammonia. 
Place. 
No. 
sample. 
Cl. 
No. of 
Germs. 
Effect on 
animals. 
Free. 
Alb. 
Al m „ 
5 
.088 
.048 
6.6 
1,001 
5+ 
10 
.071 
.038 
10.6 
91 
104- 
4 
.152 
.084 
4.4 
327 
14- 
2 
.050 
.300 
168 
34,000 
14- 
2 
.075 
.290 
9.7 
2,571 
14- 
11 
.034 
.127 
8.4 
16,624 
5+ 
2 
.310 
.750 
7 
8 
.047 
.172 
3.9 
699 
34- 
1 
.200 
.220 
6.6 
4,000 
1 
.094 
.208 
79 
3,000 
1 
.700 
.100 
4.5 
2,300 
14- 
2 
.1 
.180 
5.4 
2,750 
2 
.052 
.265 
23 
4,700 
51 
.091 
.153 
15.7 
5,979 
274- 
