12 
tures placed at measured distances between the several layers of the 
same sheet. 
Typhoid. 
Anthrax 
Spores. 
Diph- 
theria. 
Fourth layer, 5 inches 
Do. 12 inches 
— 
“T 
— 
Do. 17 inches 
I 
-U 
— 
Eighth layer, 6 inches 
— 
Do. 12 inches 
— 
■f 
— 
Controls 
+ 
-L 
1 
T 
It is plain from the above that formalin has no penetration through 
blankets when poured in one place. It seems to be equally ineffectual, 
whether the formalin is poured directly on the blanket, along its edge, 
or on absorbent material placed in the corners of, or suspended in a box, 
in the twenty-four hours’ exposure. 
A slightly better result is noticed with sheets. Typhoid and diph- 
theria are killed through 4 and 8 layers at a distance of 12 inches. 
No effect, however, was obtained with anthrax spores. 
The effect of sprinkling the formalin so that the small drops may 
have better chance to evaporate and liberate the gas was next tried 
with better results. 
SPKIXKLING SMALL AMOUNTS OF FORMALIN ON SHEETS AND BLANK- 
ETS — TIME OF EXPOSURE, TWENTY-FOUR HOURS. 
In the following tests in which the formalin was sprinTded — this was 
carefully done from a pipette drawn out so as to deliver small drops. 
Pains were taken to distribute the solution in small drops, uniformly, 
over the surface of the blanket or sheet. The drops were far enough 
apart so as not to run together. 
No. 10. 
Twenty-five hundredths cubic centimeter formalin per square foot 
sprinkled on blanket, twenty-four hours exposure. 
One cubic centimeter formalin sprinkled on the surface of a blanket 
at the bottom of a box 2 by 2 by 2 feet. The cultures on slips of filter 
paper, fresh and moist, placed between the layers of blankets. 
Layers of blankets. 
Typhoid. 
Anthrax 
spores. 
Diph- 
theria. 
1 
_ 
+ 
^ 1 
9. 
+ 
— 
— 1 
3 
“T 
_I_ ■ 
— 
4 
4 - 
i 
5 
-f 
“T 
-f 
6 
-f 
-r 
_L 
j 
Controls 
-f 
-f 1 
