610 
PROFESSOR GRAHAM ON THE MOTION OF GASES. 
Mean Results. 
Gauge barometer. 
Air. 
Nitrous oxide. 
Carbonic acid. 
From 28 to 20 inches ... - 
From 20 to 12 inches... < 
From 12 to 8 inches ... < 
From 8 to 4 inches < 
From 4 to 2 inches ■ 
f Time in seconds 
Time of oxygen = 1 . . . 
[ Time in seconds 
Time of oxygen = 1 . . . 
Time in seconds 
Time of oxygen = 1 ... 
Time in seconds 
Time of oxygen = 1 ... 
f Time in seconds 
Time of oxygen=l... 
233*5 
0*8963 
291*5 
0*8997 
205*5 
0*9000 
334 
0*8966 
343 
0*8831 
198 
0*7601 
244 
0*7531 
170 
0*7456 
276 
0*7410 
284 
0-7310 
199 
0*7639 
245 
0*7561 
170*5 
0*7478 
276 
0-7410 
287 
0*7400 
From 28 to 4 inches ... < 
Time in seconds 
Time of oxygen = 1 ... 
1064*5 
0*8983 
888 
0*7493 
890 
0*7514 
It will be observed that the numbers do not differ materially from those obtained 
with glass tubes, particularly with H. This is a capillary of great resistance, and 
therefore a deviation from uniformity of ratio may be looked for in the lower part of 
the scale. A little irregularity in the rate of air, probably accidental, appears in the 
upper part of the scale ; but as with capillary H, the coefficient for air never varies 
far from 0-9, at least between 28 and 4 inches. 
Carbonic acid and nitrous oxide exhibit the usual parallelism of rate ; but in the 
upper part of the scale the excess of the coefficient above 'J5 is rather considerable. 
Other experiments were made on the transpiration of carbonic acid into different 
aspirator jars, as the size of the jar and duration of the experiment appeared to have 
some influence on the ratios. 
Table XXVI. — Transpiration by Copper Capillary into a one-pint jar. Barom. 29 07- 
Temp. 56°. 
Gauge barometer in inches. 
Oxygen. 
Carburetted hydrogen. 
I. 
II. 
I. 
II. 
// 
// 
// 
// 
28 
0 
0 
0 
0 
20 
273 
274 
151 
151 
12 
338 
336 
186 
186 
8 
237 
236 
129 
130 
4 
383 
385 
210 
211 
2 
391 
400 
214 
213 
From 28 to 4 inches ... 
1231 
1231 
676 
678 
