POTOMAC KIVEE MATEE SUPPLY EELATIVE TO TA^PHOID FEVEE. 263 
Summary of bacteriological examinations of raw and filtered waters — Continued. 
No. 
63 
95 
122 
153 
160 
176 I 
194 I 
230 
246 
260 
276 
2S9 
306 
319 
336 
July 30 
August 7 
August 13. . . 
August 20. . . 
August 21. . . 
August 23. . . 
August 27>. . 
September 4. 
September 6 . 
September 10 
September 13 
September 17 
September 20 
September 24 
September 27 
DALECARLIA RESERVOIR, NORTH END. 
Date. 
Number 
of bac- 
teria in 
1 cc. 
Fermentation in lactose 
bouiUon. 
B. coli 
present 
in — 
0.1 cc. 
1 cc. 
10 cc. 
cc. 
600 
+ 
+ 
+ 
1 
? 
* 
— 
— 
? 
+ 
+ 
+ 
1 
0 
+ 
+ 
1 
9 
+ 
+ 
+ 
1 
? 
+ 
-1- 
+ 
1 
? 
+ 
+ 
-1- 
1 
1,200 
+ 
+ 
+ 
10 
540 
- 
+ 
+ 
440 
- 
+ 
10 
136 
- 
- 
+ 
220 
- 
+ 
+ 
10 
390 
4- 
- 1 - 
490 
-h 
+ 
10 
720 
+ 
DALECARLIA RESERVOIR, SOUTH END. 
64 
July 30 
318 
-1- 
96 
August 7 
? 
-f- 
-f- 
+ 
123 
August 13 
210 
+ 
+ 
-1- 
1 
154 
August 20 
? 
- 
+ 
-f 
10 
161 
August 21 
300 
+ 
+ 
-1- 
1 
177 
August 23 
300 
- 
+ 
-1- 
10 
195 
August 27 
? 
+ 
+ 
+ 
10 
231 
September 4 
1,100 
- 
4- 
+ 
1 
247 
September 6 '. 
800 
- 
+ 
+ 
1 
261 
September 10 
240 
- 
+ 
+ 
10 
277 
September 13 
342 
- 
+ 
-1- 
1 
290 
September 17 
360 
- 
+ 
+ 
1 
307 
September 20 
176 
_ 
_ 
320 
September 24 
270 
+ 
-f 
10 
337 
September 27 
159 
a 10 
GEORGETOWN RESERVOIR. 
65 
July 30 
338 
+ 
97 
August 7 
? 
+ 
+ 
+ 
0.1 
124 
August 13. 
? 
- 
4 - 
4 - 
10 
155 
August 20 
? 
_ 

4 - 
10 
162 
August 21 
200 
— 
+ 
+ 
10 
178 
August 23 
? 
- 
+ 
+ 
1 
196 
August 24 
650 
4 - 
4 - 
4 - 
234 
September 4 
320 
4 - 
4 - 
- 1 - 
10 
248 
September 6 
390 
- 
+ 
4 - 
1 
262 
September 10 
320 
- 
4 - 
4 - 
10 
278 
September 13 
104 
- 
4 - 
4 - 
10 
291 
September 17 
120 

+ 
4 - 
308 
September 20 
142 
4 - 
321 
September 24 
150 
— 
4 - 
4 - 
1 
338 
September 27 - 
630 
4 - 
+ 
4 - 
1 
a No indol. 
