PROFESSOR GRAHAM ON THE MOTION OF GASES. 
363 
Table IX. — Transpiration of Hydrogen and Oxygen. 
Pressure by gauge barometer. 
Hydrogen. 
Oxygen. 
Experiment I. 
Experiment II. 
Experiment I. 
Experiment II. 
inches. 
// 
// 
20 
0 
0 
0 
0 
15 
107 
107 
242 
246 
10 
158 
158 
263 
260 
8 
91 
90 . 
208 
208 
6 
120 
120 
274 
274 
4 
174 
175 
396 
398 
2 
298 
299 
687 
687 
From 20 to 2 inches 
948 
949 
2170 
2173 
By dividing the means of the hydrogen numbers by the means of the oxygen num- 
bers, as usual, we obtain the following results : — 
Transpiration times of Hydrogen. 
From 20 to 10 inches 0‘4380 
From 10 to 6 inches 0*4367 
From 6 to 2 inches 0*4363 
From 20 to 2 inches 0*4370 
These results are therefore in entire concordance with the preceding series, and 
with 0*4375 as the transpiration time of hydrogen gas. 
(5.) A series of experiments were made on the transpiration of carbonic oxide in 
conjunction with those last related. 
Table X. — Transpiration of Carbonic Oxide. 
Pressure by gauge barometer 
above 1 atmosphere. 
Experiment I. 
Experiment II. 
inches. 
// 
it 
20 
0 
0 
15 
213 
213 
10 
315 
315 
8 
181 
181 
6 
241 
241 
4 
346 
346 
From 20 to 4 inches 
1296 
1296 
The experiments on this gas are only given from 20 to 4 inches, some error of 
observation having occurred in taking the times at 2 inches. Comparing them with 
the last experiments on oxygen, we obtain the following results : — 
