50 
RAW WATER— Continued. 
APRIL. 
Day of month. 
Bacteria 
per c. c. 
B. coli in— 
Fermentation in lactose broth. 
0.1 c. c. 
1 c. c. 
10 c. c. 
0.1 c. c. 
1 c. c. 
10 c. c. 
1 
800 
+ 
_ 
_ 
+ 
2 
3 
800 
— 
- 
+ 
- 
+ 
+ 
4 
1,100 
- 
- 
+ 
- 
- 
+ 
5 
800 
- 
- 
+ 
- 
- 
4- 
6 
1,000 
- 
+ 
+ 
- 
+ 
+ 
7 
1,250 
+ 
+ 
- 
+ 
+ 
8 
550 
- 
+ 
+ 
- 
+ 
+ 
9 
700 
- 
- 
+ 
- 
- 
+ 
10 
1,400 
- 
- 
+ 
- 
- 
+ 
11 ... 
700 
- 
- 
+ 
- 
- 
+ 
12 
1 
13 
1, 750 
— 
— 
+ 
- 
- 
+ 
14 
550 
- 
- 
+ 
i + 
- 
+ 
15 
350 
- 
- 
+ 
i 
- 
+ 
16 
550 
- 
- 
+ 
- 
- 
+ 
17 
j 
18 
1,650 
1 
— 
■ + 
1 _ 
— 
+ 
19 
4,150 
1 
- 
+ 
- 
+ 
+ 
20 
1, 850 
_ 
_ 
+ 
_ 
+ 
21 
' 1, 350 
+ 
+ 
+ 
22 
■ 1,850 
— 
— 
+ 
+ 
23 
' 2, 050 
- 
- 
+ 
- 
- 
+ 
24 
750 
- 
- 
+ 
- 
- 
+ 
25 
1 600 
- 
- 
+ 
- 
- 
+ 
26 . . . 
27 
250 
- 
— 
+ 
— 
— ■ 
+ 
28 
400 
- 
- 
- 
- 
- 
- 
29 
' 390 
- 
- 
+ 
- 
- 
+ 
30 
475 
- 
- 
+ 
- 
- 
+ 
Average 
1,087 
