(506 
PROFESSOR GRAHAM ON THE MOTION OF GASES. 
Tables XIX. and XX. exhibit the transpiration rates of carburetted hydrogen and 
hydrogen, the former of which approaches to 0*55, which is certainly a sensible 
deviation from 0 5625. The number for hydrogen (0’44 18), on the other hand, is 
but very little removed from 0*4375. 
Table XXI. — Transpiration by Capillary H into a six-pint jar. 
Barom. 30*158— 30T 38. 
Gauge barometer in inches. 
Oxygen. 
Carbonic oxide. 
Nitrogen. 
Nitrous oxide. 
Carbonic acid. 
I. 
II. 
I. 
II. 
III. 
I. 
II. 
I. 
II. 
I. 
II. 
67° 
67° 
67° 
67 3 
67° 
67°-75 
67°*75 
O 
00 
68° 
oo 
00 
o 
cn> 
00 
o 
28-5 
0 ' 
O’* 
0 1 
0 1 
0 ’ 
0 
0 
0 1 
0 ' 
0 ' 
0" 
26-5 
230 
231 
202 
200 
201 
202 
202 
173 
173 
173 
173 
24-5 
237 
235 
202 
203 
204 
205 
205 
176 
175 
174 
176 
23-5 
121 
121 
107 
107 
106 
108 
108 
91 
91 
92 
92 
67" 
67° 
67°*25 
67 c -25 
67 c *25 
68° 
68° 
68° 
cn 
00 
o 
68° 
68° 
From 28'5 to 23'5 inches 
588 
587 
511 
510 
511 
515 
515 
440 
439 
439 
441 
Mean Results. 
Gauge barometer. 
Carbonic oxide. 
Nitrogen. 
Nitrous oxide. 
Carbonic acid. 
From 28-5 to 23-5 inches ( I! me “ scconlis T" 
[ iimeot oxygen=l... 
510-5 
0-8689 
515* 
0-8766 
439-5 
0-7480 
440 
0-7455 
In the preceding table carbonic oxide and nitrogen are again compared, and also 
another remarkable pair of gases having the same theoretical density, namely car- 
bonic acid and nitrous oxide. The two latter exhibit an extraordinary parallelism in 
their rates of transpiration in all experiments which were made upon them, provided 
due attention was paid to the purity of the nitrous oxide. The solution of nitrate of 
ammonia should always be Jittered, and the salt crystallized, as the presence of a 
very minute quantity of solid matter may cause a change in the mode of decompo- 
sition of the salt by heat, and the evolution of a very sensible quantity of free 
nitrogen. 
The carbonic oxide of experiments 1 and 2 was obtained by the action of oil 
of vitriol on pure oxalic acid; that of experiment 3 was prepared by the process 
of Mr. Fownes, namely heating oil of vitriol upon the ferrocvanide of potassium, 
avoiding a violent reaction by a proper regulation of the temperature. The gas of 
both processes was washed with alkali, although this precaution is scarcely required 
with the gas of the last process. The transpiration results are exactly the same with 
the gas prepared in both ways. 
