EXPERIMENT NO. S^Con tinned. 
means growth: — no growth.] 
Organism. 
How exposed. 
Time of expo- 
sure In min- 
utes, and re- 
sults. 
B. pyocyaneus 
B. typhosus 
B. coli communis 
Staphylococcus pyog. aur 
B. typhosus 
B. pyocyaneus 
Glass 
do 
do 
do 
Filter paper 
Wilson method. 
30 60 120 180 
Most of the nonspore-bearing organisms were killed within 1 hour 
in the above experiments. The spores of B. subtil is exposed directly 
on slips of filter paper were destroyed within 2 hours, while the 
same organisms exposed by the Wilson method were not killed within 
3 hours. 
In each experiment the relative humidity was raised almost to 
saturation at the end of 2 hours: the temperature was also 
raised several degrees. 
The following three experiments Xos. 35. 36, and 37) were done at 
a lower temperature than the above experiments. In these the tem- 
perature and humidity were raised very materially. Most of the non- 
spore-bearing organisms were killed within 2 or 3 hours. 
In Xos. 36 and 37 the organisms were not exposed until 2 hours after 
starting the lamp. 
EXPEEIMEXT XO. 35. 
Generating lamp. 
* Methyl alcohol, 1,000 c. c. 
Capacity of room. 2/100 cubic feet. 
Weather: Cloudy, light wind. 
Tempera- 
ture. 
Relative 
humidity. 
Absolute 
humidity 
grams per 
cubic foot) . 
Before starting lamp 
° F. 
42 | 
Per cent. 
69 
2.11 
After 2 hours 
49 
86 
3.38 
After 4 hours ! 
52 1 
84 
3.66 
_ime of exposure of organisms counted from rime :f starting the lamp. 
