12 
Colorado Experiment Station 
COMPARATIVE RESULTS OF CO-OPERATIVE INVESTIGATION 
Samples Collected November 11, 1916. 
Table No. II.—Number of Bacteria per c. c. on Agar at 37° C. 
after 24 hours. « 
P* . 
r O 
U2 
Source 
Jno. B. 
Ekeley 
State 
Chemist 
U. of C. 
W. G. 
Sackett 
Bact. 
Colo. Ag. 
Exp. Sta. 
Dr. W. C. 
Mitchell 
Bact. City 
& Co. of 
Denver 
H. I. de 
Berard 
Chemist 
D. U. W. 
Company 
Average 
1 . Mississippi Av. 
filtration Galler¬ 
ies, Inlet W. D. 
Res. 
2 
1 
Cont. 
1 
1 
2. Platt Riv. Raw 
—Intake Mars- 
ton Lake—4 8" 
Cond. 
17 
51 
73 
68 
52 
3. Bear Cr. Raw— 
Intake Marston 
Lake—Flume 
61 
76 
68 
280 
121 
4. Marston Lake— 
Outlet N. S. 
Plant—Raw . . . 
27 
36 
25 
104 
48 
5. Marston Lake N. 
S. Plant-Treated 
6 
5 
11 
12 
8 
6. P. C. Infiltration 
Galleries—30" 
Cond. Wynetka . 
1 
1 
6 
2 
2 
7. Slow Sand 
Filters, Treated 
—4 0" Cond. 
Wynetka . 
2 
0 
7 
7 
4 
8. Willard Rapid 
Filters, Treated 
—34" Cond. 
Wynetka . 
4 
2 
5 
2 
3 
9. Marston Lake 
So. Side Plant 
—Treated—4 8" 
Cond. Wynetka . 
2 
0 
3 
\ 
3 
2 
10. Drinking Foun¬ 
tain in City— 
Cor. 1st & Bdwy.j 3 
3 
17 
11 
8 
11, Cherry Cr. In¬ 
filtration Galler- | 
ies—Cap. Hill 
Res.j 
1 
1 mm 
1 
2 
12. Tap in City 
Chemical 
Laboratory . 
4 
o 
6 
1 
7 | 4 
