42 
A summary of conditions and results is given in each of the follow- 
ing experiments: 
EXPERIMENT NO. IS. 
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 hour. 
Quantity of formaldehyde found per cubic foot, 0.06037 gram. 
(Determination made by drawing air from room, beginning 22 minutes after exhausting retort 
and consuming 1 hour 6 minutes in the drawing.) 
Yield of formaldehyde, 47.07 per cent. 
Weather: Slight wind southwest, cloudy. 
Tempera- 
ture. 
Relative 1 
humidity. 
Absolute 
humidity 
(grams per 
cubic foot) . 
Before beginning to introduce the gas 
0 F. 
73.5 
Per cent. 
73 
6.40 
After 1 hour 
74. 5 
86 
7.91 
After 2 hours 
75. 0 
86 
8.00 
Note. — In all the experiments with this method the temperature and humidity are given from the 
time of beginning to introduce the gas. The organisms were exposed immediately after exhausting 
the retort. 
[+ means growth; — no growth.] 
Organism. 
How exposed. 
Time of exposure in min- 
utes, and results. 
2 
5 j 10 
20 
30 
60 
B . pyocyaneus 
Filter paper 
+ 
+ - 
— 
— 
B. coli communis 
do 
-f- 

- 
— 
— 
B. dysenterise 
do 
+ 
+ - 
- 
- 
- 
B. subtUis 
do 
+ 
+ + 
4“ 
— 
B. coli communis 
Wilson method 
+ 
+ + 
— 
— 
- 
B. subtilis 
do 
+ 
+ + 
+ 
+ 
— 
EXPERIMENT NO. 19. 
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 hour. 
Percentage yield of formaldehyde undetermined. 
Weather: Slight westerly wind, clear. 
Tempera- 
ture. 
Relative 
humidity. 
Absolute 
humidity 
(grams per 
cubic foot). 
Before beginning to introduce the gas 
° F. 
74. 5 
Per cent. 
60 
5. 52 
After 1 hour. 
75. 0 
84 
7.85 
After 2 hours 
75. 0 
82 
7. 66 
See note, Experiment No. 18. 
