no 
TYPHOID FEVER IX DISTRICT OF COLUMBIA 
The folloMmo: chemical analyses bv Doctor LAmch of ice manufac- 
tilled in the District of Columbia ivere placed at our disposal by Dr. 
William C. Woodward: 
Xo. 
of 
sam- 
ple. 
Dealer or manufacturer. 
Date. 
Kind of ice.a 
Color. 
Odor. 
Condi- 
tion. 
Chlo- 
rine. 
2 
American Ice Co 
1906. 
Aug. 27 
Can 
Colorless.. 
Odorless. . 
Clear 
4.00 
3 
do 
do . . . 
Plate 
do 
do .... 
do 
4.00 
4 
Chapin A Saks Co 
do . . . 
do 
do 
do 
do. . . 
2.00 
5 
Home Ice Co 
do... 
Can 
do 
do 
do. . . 
4.00 
6 
C. C. Balderson 
Aug. 28 
Not stated.. 
do 
do.... 
do. . . 
7.00 
7 
American Ice Co 
do . . . 
Natural 
do 
do 
do. . . 
2.00 
8 
Chr. Heurich 
do. . . 
Can 
do 
do 
do . . . 
5.00 
9 
do 
do. . . 
Plate 
do 
do 
do. . . 
3.00 
10 
Nicholas Auth Co 
Aug. 29 
Can 
do 
do 
do. . . 
2.00 
11 
Georgeto\\m Ice Co 
do . . . 
Plate 
do 
do 
do . . . 
2.00 
12 
Crystal Plate Ice Co 
do . . . 
Can 
do. . . . 
do .... 
do - . . 
2.00 
13 
American Ice Co 
do . . . 
Plate 
do. 
do 
do - . . 
2.00 
14 
H. Loefller 
do . . . 
Can 
do 
do 
do . . . 
4.00 
15 
Purity Ice Co 
do . . . 
do 
do 
do 
....do... 
3.00 
16 
do 
do . . . 
Plate 
do 
do. : . . 
do . . . 
3.00 
No. 
of 
sam- 
ple. 
Nitrogen as — 
Oxygen re- 
Dealer or manufacturer. 
Ammonia. 
quired to 
oxidize or- 
- 
Free. 
.\lbu- 
minoid. 
Nitrites. 
Nitrates. 
ganic mat- 
ter. 
2 
American Ice Co 
0.12 
0.04 
0.00 
Trace 
O.SS 
3 
do 
.32 
.12 
.00 
do 
1.32 
4 
Chapin & Saks Co 
.24 
.07 
.00 
do 
.96 
5 
Home Ice Co 
.16 
.07 
.00 
do 
.96 
6 
C. C. Balderson 
.15 
.12 
.00 
do. . . . 
.80 
7 
American Ice Co 
.08 
.05 
.00 
do 
.88 
8 
Chr. Heurich 
.08 
.01 
.00 
do 
1.00 
9 
do 
.04 
.01 
.00 
do 
1.20 
10 
Nicholas Auth Co 
.18 
.03 
.00 
do 
.72 
11 
Georgetown Ice Co 
.19 
.03 
.00 
do 
.48 
12 
Crystal Plate Ice Co 
.16 
.03 
.00 
do 
.32 
13 
American Ice Co 
.20 
.04 
.00 
do 
1.08 
14 
H. Loeffler 
.25 
.06 
* .00 
do 
1.04 
15 
Purity Ice Co 
.30 
.01 
.00 
do 
.64 
16 
do 
.16 
.05 
.00 
do 
.40 
• 
a According to Doctor Lynch the analyses of these samples of ice do not shovv the presence of any 
injurious contamination. 
Some interesting conclusions may be drawn from a comparison 
between the chemical and bacteriological examination of the ice 
samples and the water used for manufacturing the ice. 
The ice samples Nos. 24, 26, 27, 29, 32, and 34 were frozen by the 
plate system from tap (river) water. Such ice, however, contained 
conspicuously less total solids, less chlorine, and less nitrates than 
are found in tap water. This may be explained by an extrusion of 
