120 
THOMPSON YATES LABORATORIES REPORT 
through continuously, the plug being removed each day for analysis. B. coli was 
absent in every analysis. 
Experiment IV- — In this experiment the air analysed was that of two of the 
wards of the Royal Infirmary, and B. coli was also found to be absent. 
Experiment V- — The air was that of an ill-ventilated stable, and was examined 
on three occasions ; on the first B. coli was isolated and found present in 238 litres. 
The air was drawn through during the night in each instance, and the plug analysed 
early on the following morning. 
TABLE I 
Experiment I — Air of College Grounds 
Date 
Quantity of air 
aspirated 
Quantity analysed 
Remarks 
1900 
April 30-3 1 
596 litres 
B. coli absent in 24.0 litres 
Rain on 29 
Bacillus closely resembling B. fcecalis 
alcaligenes isolated 
Experiment II — Air of College Grounds 
May 14-15 
3,570 litres 
B. coli absent in 890 litres 
No rain since May 12 
May 15-16 
2,580 litres 
B. coli absent in 64.6 litres 
No rain since May 1 2 
May 16-17 
3,960 litres 
B. coli absent in 1,950 litres 
No rain since May 12, days from 
Ma} r 16-18 were dry and dusty, 
and much dust was blowing about 
May 17-18 
1,790 litres 
B. coli absent in 880 litres 
May 18-19 
3, 1 30 litres 
B. coli absent in 620 litres 
Experiment III — Air at the Corner of Brownlow Hill and Ashton Street 
Liverpool 
May 2 +-2 5 
3,856 
litres 
B. 
coli absent 
in 
1,930 litres 
Machine calibrated May 24 ; rain 
on May 23 ; May 25, a dry, dusty 
day 
May 25-26 
3,670 
litres 
B. 
coli absent 
in 
1 ,840 litres 
Mry 26, windy, dusty day 
May 26-28 
1 2,400 
litres 
B. 
coli absent 
in 
4,135 litres 
May 28-30 
7,650 
litres 
B. 
coli absent 
in 
3,826 litres 
May 30-31 
4,520 
litres* 
B. 
coli absent 
in 
2,260 litres 
* At the conclusion of Experiment III, it was found that the washer of the piston of the pump was slightly worn out, so 
that at the end of the experiment the registered quantity of air may be a little too large, the friction of the machine being less. 
A calibration after a new washer had been fitted gave the same number as on May 24. 
