PROFESSOR GRAHAM ON THE MOTION OF GASES. 
613 
Mean Results. 
Gauge barometer. 
Air. 
Hydrogen. 
From 28 to 20 inches < 
From 20 to 12 inches < 
From 12 to 8 inches < 
f Time in seconds 
Time of oxygen =1 
Time in seconds 
Time of oxygen =1 
r Time in seconds 
Time of oxygen =1 
1139 
0*8982 
1413 
0*8991 
993*5 
0*8955 
560 
0*4416 
698*5 
0*4445 
494*5 
0*4457 
From 28 to 8 inches < 
f Time in seconds 
Time of oxygen = 1 
3545*5 
0*8978 
1753 
0*4439 
In these experiments with a large aspirator jar and long times, the rate of air con- 
tinues very nearly 0 - 9, and that of hydrogen approaches CP44. The rates at the upper 
part of the scale are to be particularly attended to, as most uniform, and as represent- 
ing pretty nearly transpiration into a vacuum. 
Table XXX. — Transpiration by Copper Capillary into a six-pint jar. 
Barom. 30”23. Temp. 58°‘5. 
Gauge barometer in inches. 
Air. 
Oxygen. 
Carbonic acid. \ 
I. 
II. 
I. 
II. 
I. 
II. 
59° 
59° 
59°*25 
59° 
59°*5 
59°*75 
28 
0" 
0" 
0" 
0" 
0" 
0" 
24 
550 
550 
611 
612 
469 
468 
20 
590 
589 
655 
655 
498 
499 
12 
1570 
1570 
1183 
1183 
8 
1103 
1104 
824 
825 ' 
From 28 to 8 inches ... 

3939 
3941 
2974 
2975 
Mean Results. 
Gauge barometer. ! Air. 
Carbonic acid. 
From 28 to 24 inches... • 
From 24 to 20 inches... < 
From 20 to 12 inches... < 
From 12 to 8 inches ... < 
From 28 to 8 inches ... < 
f Time in seconds 
Time of oxygen = 1 . . . 
f Time in seconds 
Time of oxygen = 1... 
r Time in seconds 
Time of oxygen — 1 . . . 
Time in seconds 
Time of oxygen = l... 
f Time in seconds 
Time of oxygen = l... 
550 
0*8994 
589*5 
0*9000 
468*5 ! 
0 7661 
498*5 
0*7610 
1183 
0*7535 
824*5 
0*7472 
2974*5 
0*7549 
The preceding table contains an experiment on carbonic acid transpired into a 
large jar. The coefficient of that gas still considerably exceeds 0'75 in the upper part 
of the scale. 
It appears then that the rates of transpiration are similar through glass and copper 
