54 
EXPERIMENT NO. 29. 
Sheet spraying. 
Formalin, 600 c. c. 
Capacity of room. 2,000 cubic feet. 
Percentage of formaldehyde liberated was not determined. 
Condition of weather: Light northwest wind, clear. 
Before spraying. 
1 hour after 
2 hours after 
Tempera- 
ture. 
' 
Relative 
humidity. 
Absolute 
humidity 
grams per 
cubic foot . 
° F. 
Per cem. 
74.0 
SO 
7.25 
74. 5 
86 
7.91 
76.0 
89 
8.6 
Organisms not exposed until 1 hour after spraying sheets. 
means growth: — no growth.] 
Organism. 
How exposed. 
Time of exposure in minutes, 
and results. 
5 
10 
20 
30 
60 
90 
120 
B. pyoeyaneus 
Filter paper 
+ 





B. coli communis 
4- 
— 
— 
— 
— 
— 
Do 
Wilson method 
T 
4- 
4- 
— 
— 
— 
B. dysenteric 
Filter paper 
-f 
— 
— 
— 
— 
— 
B. subtiiis 
4- 
4- 
4- 
— 
— 
— 
Do 
Wilson method 
4- 
+ 
+ 
— 
EXPERIMENT NO. 30. 
Sheet spraying. 
Formalin. 600 c. c. 
Capacity of room. 2.000 cubic feet. 
Quantity of formaldehyde used per cubic foot, 0.107 gram. 
Quantity of formaldehyde found per cubic foot, 0.0252 gram. 
Determinations made by drawing air from room beginning 1 hour 40 minutes after spraying 
sheets and consuming 1 hour 15 minutes in the drawing. 
Yield of formaldehyde, 23.55 per cent. 
Condition of weather: Light southerly wind, light clouds. 
Tempera- 
ture. 
Relative 
humidity. 
Absolute 
humidity 
grams per 
cubic foot . 
Before spraying 
°F. 
7S j 
Per cent. 
83 
8.52 
1 hour after 
i i 
87 
S. 67 
2 hours after 
79 
85 
9.01 
Organisms not exposed until 1 hour after spraying sheets. 
[— means growth: — no growth. 
Organism. 
How exposed. 
Time of exposure in minutes 
and results. 
5 
10 
20 
30 
60 
90 
120 
B. pyoeyaneus 
B. coli communis 
Filter paper 
Do 
Wilson method 
4- 
4- 
- 
— 
- i 
- 
B. dysenteric 
B. subtiiis 
Filter paper 
_ 

■ 


Do 
W ilson method 
-i- 
4- 
4- 
+ 
- 
- 
B. dysenteric . 
