43 
EXPERIMENT NO. 19— Continued. 
[+ means growth; — no growth.] 
Organism. 
B. pyocyaneus . . . 
B. coli communis. 
B. dysenterix 
B. subtilis 
B. coli communis. 
B. subtilis 
How exposed. 
Filter paper 
....do 
do 
do 
Wilson method. 
do 
Time of exposure in min- 
utes, and results. 
2 
5 
10 
20 
30 
60 
+ 
+ 
— 
— 
— 

+ 
+ 
+ 
+ 
— 
— 
— 
— 
+ 
+ 
— 
— 
— 
+ 
+ 
+ 
+ 
- 
- 
+ 
+ 
+ 
+ 
+ 
— 
EXPERIMENT NO. 20. 
Retort without pressure. 
Formalin, 600 c. c.; glycerin, 6 c. c. 
Capacity of room, 2,000 cubic feet. 
Quantity of formaldehyde used per cubic foot, 0.107 gram. 
Time required to exhaust material in retort, 1 horn'. 
Quantity of formaldehyde found per cubic foot, 0.04708 gram. 
(Determination made by drawing air from room beginning 25 minutes after exhausting retor 
and cons umin g 1 hour 20 minutes in the drawing.) 
Yield of formaldehyde, 44 per cent. 
Weather: Rather strong northwest wind; clear. 
Tempera- 
ture. 
Relative 
humidity. 
Absolute 
humidity 
(grams per 
cubic foot). 
Before beginning to introduce the gas 
° F. 
74 
75 
74 
Per cent. 
74 
84 
89 
6.70 
7.85 
8.06 
After 1 hour 
After 2 hours 
See Note, experiment No. 18. 
[+ means growth; — no growth]. 
Organism. 
How exposed. 
B. pyocyaneus 
B. coli communis . 
B. dysenterix 
B. subtilis 
B. coli communis. 
B. subtilis 
Filter paper 
do 
do 
do 
Wilson method. 
do 
Time of exposure in min- 
utes, and results. 
5 10 20 30 45 60 
+ 
+ 
+ 
+ 
+ 
+ 
0 
+ 
+ 
