264 
TYPHOID FEVER IH DISTRICT OF COLUMBIA, 
Summary of bacteriological examinations of raw and filtered waters — Continued. 
WASHINGTON RESERVOIR. 
No. 
Date. 
Number 
of bac- 
teria in 
1 cc. 
Fermentation in lactose 
bouillon. 
0.1 cc. 
1 cc. 
10 cc. 
1 
July 16 
50 
-b 
29 
July 23 
36 
- 
+ 
+ 
61 
July 30 
192 
- 
- 
-b 
93 
August 7 
? 
- 
- 
- 
125 
August 13 
100 
- 
+ 
+ i 
151 
August 20 
? 
- 
-b 
-b 
165 
August 21 
? 
+ 
+ 
+ 
173 
August 23 
200 
— 
-b 
-b 
180 
August 24 
50 
- 
- 
-b 
188 
August 25 - 
? 
— 
+ 
+ 
192 
August 27 
150 
- 
-b 
-b 
199 
August 28 
? 
-1- 
- 
-b 
206 
August 29 
470 
- 
— 
+ 
212 
August 30 
610 
-b 
-b 
-b 
220 
August 31 
190 
-b 
228 
September 4 
420 
— 
-b 
-b 
236 
September 5 
430 
— 
+ - 
+ 
244 
September 6 
300 
— 
-b 
+ 
263 
September 10 
570 
+ 
-b 
-b 
279 
September 13 
150 
— 
- 
-b 
292 
September 17 
69 
-1- 
+ 
-b 
309 
September 20 
1,315 
+ 
+ 
322 
September 24 
80 
— 
+ 
339 
September 27 
82 
— 
+ 
-b 
B. coK 
present 
in— 
cc. 
a 10 
1 
1 
10 
1 
10 
10 
10 
10 
10 
10 
10 
1 
10 
FILTERED WATER RESERVOIR. 
42 
62 
94 
126 
July 25 
July 30 
August 7 
August 13 & 
33 
34 
? 
+ 
-b ■ 
-b 
-b 
152 
August 20 
? 
— 
— 
— 
166 
August 21 
? 
- 
- 
- 
174 
August 23 
60 
- 
- 
- 
181 
August 24 
80 
— 
- 
- 
189 
August 25 
? 
- 
- 
- 
193 
August 27 
? 
- 
- 
-b 
200 
August 28 
30 
- 
+ 
207 
August 29 
32 
- 
— 
213 
August 30 
50 
- ■ 
-b 
221 
August 31 
39 
- 
- 
- 
229 
September 4 
34 
- 
- 
- 
237 
September 5 
35 
- 
— 
- 
245 
September 6 
26 
- 
- 
- 
264 
September 10 
33 
— 
-b 
293 
September 17 
30 
- 
- 
- 
310 
September 20 
18 


323 
September 24 
24 
— 
— 
— 
340 
September 27 
13 
— 
— 
— 
oNo indol. 
b Lost. 
