EIGHTH REPORT. 
116 
SPRING WATER. 
Most of the springs in Michigan are surface springs and are more or 
less subject to bacterial contamination. 
TABLE V. 
Spring Water. 
Place. 
No. 
sample. 
Ammonia. 
Cl. 
No. of 
Germs. 
Effect on 
animals. 
Free. 
Alb. 
1 
0.72 
.174 
4.64 
2,880 
1 
.010 
30 
500 
10 
.0386 
.102 
5.89 
557 
1 
.260 
.010 
3.3 
87 
2 
.076 
.044 
4.2 
70 
Hart. 
1 
.030 
.120 
9.9 
36,000 
*+ 
2 
.205 
.303 
.7 
4 
1 
.010 
.010 
5 1 
600 
1 
.030 
.080 
26.4 
27,500 
Negaunee. 
2 
.035 
.080 
3 
80 
+• 
2 
.230 
.150 
27.15 
1,000 
1 
.020 
.080 
29 5 
1,940 
1 
2 
.049 
.166 
130 
215 
Traverse City. 
1 
.020 
.020 
2.5 
4,200 
4- 
Average. 
28 
.072 
.088 
CO 
oo 
1,309 
34- 
*This germ count not included in average. 
CISTERN WATER. 
Six samples of cistern water were examined; chemical analysis of 
three of these show an average Free NH, of 1.001 parts albumenoid, NH S 
of .558 pts. and Cl. as Nacl=G. The bacteriological examination showed 
an average of 85,040 per c. c. Culture were fatal to animals in five of 
the six cases. 
ARTESIAN WATER. 
Nine samples were examined. The average chemical composition of 
eight was as follows: Free NH„=0.165 pts. Alb. NH n 0.092. The aver¬ 
age chlorine would be valueless as the highest was 990 pts. and the low¬ 
est 1.32. The bacteriological examination showed from 80 to 56,400 per 
c. c. In but one water were germs absent. Cultures killed in four 
cases — in two of these B. coli was found. 
SUMMARY. 
In concluding I will separate the chemical from the bacteriological 
results. Tabulating the former we have the following: 
