116 
specimens. I have not known any mills or workshops so 
deficient in air. I consider a room bad when it loses 1,000, 
and workshops very bad when they lose 2,000 of oxygen out 
of a million parts ; here the loss is actually 5,000 less than 
the parks of Loudon. The circumstance is strange, and I 
hope unusual. A scientific friend happened to call my 
attention to it and wished me to examine the air. The 
moisture from the window was collected and there were seve- 
ral ounces obtained, and more might have been easily found. 
It was perspiration in great part, the smell of it was distinct. 
It is putrefying, and decolorises more permanganate now than 
it did at first. Mere change of air will not purify a room 
like this — a current must pass through it for a long time 
until complete oxidation takes place. 
Oxygen per cent in some Specimens of Air. 
18ft. abovo water. Fine day. 
2 30 p.m. 
Lat. 43-05, W. 17-12. 
21-0100 
21-0000 
20-9700 
St. John’s, Antigua. 
April 11th, 1865. 9 a.m. 
Showery morning. 
20-9600 
20- 9100 
21 - 0000 
Mean 20-9900* 
Mean 20 9500 
Law Court, Feb. 2nd, 1866. 
20-6400 
20-6700 
Law Court, from the lantern, 
4 30 p.m. just as the court was 
closing. 
20-5000 
20-4800 
Mean 20 6500 
Mean 20-4900 
* May be rend 209,900 in & million, and so with the others. 
