620 
PROFESSOR GRAHAM ON THE MOTION OF GASES. 
Table XXXVI. — Transpiration by Capillary E into a two-pint jar. Barora. 30-08. 
Temp. 60°. 
Gauge barometer in 
inches. 
Nitrogen. 
Nitric oxide. 
Oxygen. 
I. 
II. 
III. 
I. 
II. 
I. 
II. 
// 
// 
// 
// 
// 
// 
// 
28 
0 
0 
0 
0 
0 
0 
0 
20 
231 
232 
237 
235 
266 
267 
12 
286 
287 
286 
288 
287 
327 
328 
8 
200 
200 
202 
203 
206 
227 
227 
4 
320 
317 
320 
313 
312 
363 
364 
2 
314 
320 
316 
311 
315 
361 
361 
From 28 to 2 inches... 
1351 
1356 
1352 
1355 
1544 
1547 
Mean Results. 
Gauge barometer. 
Nitrogen. 
Nitric oxide. 
From 28 to 12 inches - 
From 12 to 4 inches < 
From 4 to 2 inches < 
f Time in seconds 
Time of oxygen=l... 
Time in seconds 
Time of oxygen = 1 ... 
f Time in seconds 
Time of oxygen=l... 
517*83 
0-8717 
519-7 
0-8801 
316-7 
0-8772 
523-5 
0-8815 
517 
0-8755 
313 
0-8670 
From 28 to 2 inches - 
f Time in seconds 
Time of oxygen = 1... 
1354-2 
0-8768 
1 353-5 
0-8764 
The number for nitric oxide (NG 2 ) approaches very closely to that of nitrogen, if 
it does not actually coincide with that number; yet the specific gravities of these 
two gases are different, that of nitric oxide being T0405, air =1 ; or 0 - 9375, oxygen 
= 1 ; the mean between the densities of oxygen and nitrogen gases. It would appear 
from this that the coefficients of transpiration of gases are less various than their 
specific gravities. In conducting experiments with this gas, the surface of the mer- 
cury in the gauge tube is tarnished, which causes it to adhere to the glass and 
descend irregularly, so that the observations want the usual uniformity, as seen in 
both tables. When a few drops of water were placed above the mercury in the 
gauge barometer, its descent became more regular. This gas acted inconveniently 
in another way, by forming a solid compound with the oil in the cylinders, and thus 
clogging the action of the air-pump. 
