ON THE CARBONIC ACID, ORGANIC MATTER, ETC., IN AIR. 
71 
One-roomed houses. 
Two-roomed houses. 
Houses of four rooms and upwards. 
Above outside air. 
No. of 
cases. 
Lowest. 
Highest. 
Average. 
No. of 
cases. 
Lowest. 
LI ighest. 
Average. 
No. of 
cases. 
Lowest. 
Highest. 
Average. 
Temperature (°F.) 
21 
9 
30 
19 
9 
16 
23 
18 
13 
5 
19 
14 
Carbonic acid .. 
25 
1-7 
16 5 
6-6 
11 
2-8 
9-0 
5-5 
10 
1-7 
6-1 
3-3 
Organic matter.. 
25 
0 
26-3 
6'2 
10 
0 
3'9 
2-2 
16 
0 
3-2 
1-4 
Total micro¬ 
organisms :— .. 
28 
6 
240 
60 
13 
8 
128 
46 
18 
0-5 
22 
9-0 
Bacteria 
19 
6 
120 
58 
11 
0 
118 
43 
16 
0*5 
16 
8-5 
Moulds 
19 
0 
5 
1-2 
11 
0 
10 
2-2 
16 
0 
1 
0’4 
Or, taking the average quantity (in excess of outside air) of carbonic acid, organic 
matter, and micro-organisms respectively in houses of four and more rooms as unity, 
then in one- and two-roomed houses we have as follows :— 
Houses of four rooms 
and upwards. 
Two-roomed houses. 
One-roomed houses. 
Cubic space per person. 
Carbonic acid. 
1 
1 
0-13 
T5 
0T1 
2-0 
Organic matter. 
1 
1-6 
4-4 
Micro-organisms (total). 
Bacteria. 
1 
1 
5-1 
5-1 
6-7 
6-9 
Moulds. 
1 
55 
3-0 
The influence of cubic space per person in sleeping-rooms is indicated in the 
following Table, which includes all classes of houses. These are divided into seven 
groups, according to the cubic sleeping-space per person. 
Cubic space per 
person. 
No. of 
houses. 
Temperature. 
Carbonic 
Acid. 
Organic 
matter. 
Total micro¬ 
organisms. 
Bacteria. 
Moulds. 
Cubic feet. 
100- 180 
14 
55 
11-5 
15-1 
80 
78 
1-8 
180- 260 
18 
54 
107 
15-1 
49 
47 
1-5 
260- 340 
6 
53 
103 
11-8 
32 
31 
07 
340- 500 
4 
57 
9-2 
8-4 
42 
40 
2-1 
500-1000 
6 
54 
8-6 
5-6 
6 
6 
0 
1000-2500 
8 
53 
67 
3-9 
91 
8-5 
07 
2500-4000 
4 
57 
7-9 
5-0 
131 
12-8 
0-4 
It will be seen from the above that the carbonic acid, organic matter, and micro¬ 
organisms* all diminish in quantity as the cubic space per person increases from 100 
to about 1,000 cubic feet. When, however, the cubic space increases beyond 1,000 
cubic feet, the carbonic acid, organic matter, and micro-organisms show a slight, but 
* See p. 95. 
