PROFESSOR GRAHAM ON THE MOTION OF GASES. 
597 
Mean Results. 
Gauge barometer. 
Nitrogen. 
Carburetted 
hydrogen. 
From 28 to 20 inches 
From 20 to 12 inches 
From 12 to 4 inches • 
From 4 to 2 inches... - 
f Time in seconds 
Time of oxygen = 1 . . . 
f Time in seconds 
Time of oxygen =1... 
f Time in seconds 
Time of oxygen = l... 
f Time in seconds 
Time of oxygen =1... 
206-3 
0-8760 
252-5 
0-8716 
452-5 
0-8685 
256-7 
0-8845 
133 
0-5647 
162-7 
0-5618 
290-5 
0-5576 
164-7 
0-5677 
From 28 to 2 inches < 
Time in seconds 
Time of oxygen =1... 
1168-7 
0-8740 
751 
0-5619 
Table XI. — Transpiration by Capillary B into a half-pint jar. Barom. 29 *2. 
Gauge barometer in inches. 
Oxygen. 
Hydrogen. 
Carbonic acid. 
I. 
II. 
III. 
I. 
II. 
III. 
I. 
II. 
III. 
62° 
62°-5 
64°-5 
65° 
65° 
65°-5 
66° 
66° 
66° 
28 
0" 
0" 
0" 
0" 
0" 
0" 
0" 
0" 
0" 
20 
234 
234 
234-5 
103 
103 
103 
174-5 
174 
173 
12 
285 
287-5 
288-5 
126-5 
126 
126-5 
212 
211-5 
212 
4 
516 
516 
516-5 
229-5 
228 
228 
37 6 
379-5 
376 
2 
290 
292-5 
288-5 
129 
126 
132 
213 
212-5 
62°-5 
64° 
64°-5 
65° 
65°-5 
66° 
66° 
From 28 to 2 inches ... 
1325 
1330 
1328 
588 
583 
589-5 
978 
974 
Mean Results. 
Gauge barometer. 
Hydrogen. 
Carbonic acid. 
From 28 to 20 inches < 
From 20 to 12 inches ■ 
From 12 to 4 inches - 
From 4-to 2 inches... ■ 
Time in seconds 
103 
0-4398 
126-3 
0-4403 
228-5 
0-4425 
129 
0-4443 
173-8 
0-7424 
211-8 
0-7385 
377*3 
0-7310 
212-75 
0-7327 
Time of oxygen =1 
f Time in seconds 
Time of oxygen — 1 
f Time in seconds 
[ Time of oxygen = 1 
Time in seconds 
[ Time of oxygen — 1 
From 28 to 2 inches < 
f Time in seconds 
586-8 
0-4413 
976 
0-7351 
|_ Time of oxygen = 1 
Taking the higher part of the scale, from 28 to 20 inches, which approaches nearest 
to transpiration into a vacuum, we obtain the following times of transpiration : — 
Oxygen 1, nitrogen 0*8760, hydrogen 0*4398, carburetted hydrogen 0*5647, car- 
bonic acid 0*7424 ; which almost coincide with the numbers lately mentioned in 
relation to these gases, with the exception of carbonic acid, which is 0*7424 instead 
of 0*75. With the great resistance of this tube, the variation in ratio at different parts 
of the scale has also become very small, being only 0*0045 for hydrogen and 0*0097 
for carbonic acid. The disturbing influence of effusion appears therefore to be in a 
great measure eliminated. It is also worthy of remark, that the time of passage of 
