28 
SOUTHEAST SECTION-Continued. 
Location. 
Date closed. 
I, between Eleventh and Twelfth streets 
Jefferson, between Monroe and Fillmore streets 
L, between Thirteenth and Fourteenth streets 
Ninth and E streets 
O, between Half and First streets 
Seventh and B streets 
Seventh street, between North Carolina avenue and C street 
Seventeenth and Harrison streets 
Third and C streets 
Third street and Pennsylvania avenue 
Thirteenth, between D and E streets 
July 23, 1907 
July 19, 1907 
July 22, 1907 
Do. 
July 24, 1907 
July 23, 1907 
July 16, 1907 
July 19, 1907 
July 16, 1907 
July 17, 1907 
July 23, 1907 
It will be noticed that the closing of these wells occurred too late 
to account for the improvement in the situation this season. 
The following is a list of shallow wells in the District of Colum- 
bia still in operation, and, excepting the one on Quincy street, be- 
tween Twelfth and Thirteenth streets NE., all are out of immediate 
touch with the public water-main system. There are various shallow 
wells at public schools of which there is no record at the health office, 
and they are not included in this list : 
N ortliwest . — Massachusetts avenue, extended, near Wisconsin ave- 
nue; Tenleytown road, Tenleytown. 
Northeast . — Benning cross roads; Quincy street between Twelfth 
and Thirteenth streets. 
Southeast . — Elvan avenue, west of Stanton avenue; Hamilton 
road, near Jewish cemetery; Stanton avenue and Pomeroy avenue; 
Twentieth and Joliet streets, Garfield; T street hill. Hillsdale. 
BACTERIOLOGIC EXAMINATION OF THE POTOMAC WATER SUPPLY. 
This season the bacteriologic examination of water was confined to 
that supplied from the Potomac River, this now being almost the sole 
supply of water for the city of Washington. 
The examinations were made in the Division of Pathology and 
Bacteriology of the Hygienic Laboratory by Passed Assistant Sur- 
geons George W. McCoy and A. M. Stimson and Assistant Surgeon 
W. W. Miller. As in the previous year, the technique recommended 
by the committee on standard methods of water analysis of the 
American Public Health Association on January 9, 1905, was fol- 
lowed. From May 15 to November 30 two samples of water were 
obtained and examined daily, excejjt Sundays. One sample was 
taken from the inlet at Dalecarlia Reservoir, this representing the 
Potomac River water as it is introduced into the first storage reser- 
voir, and one sample from the outlet of the filtered-water reservoir, 
this representing the mixed efficients from all the filter beds and being 
the water just before it passes from the reservoir to the conduits for 
distribution to the city. 
