54 
DR. W. A. BONE AND MR. R. V. WHEELER ON THE COMBINATION OF 
gas at the end of Experiment V. was exactly 2'0. Nor could it be ascribed to a mere 
reduction in pressure, as the following experiment (YI.) proves. 
Before this experiment the apparatus had been continuously exhausted for three days, 
the combustion tube being maintained at 220° all the time, so as to extract as far as 
possible any gas condensed or occluded by the metal. A charge of normal electrolytic 
gas was then admitted, and the rate of combination during the next hour determined. 
At the end of the hour more gas was admitted until the original pressure was restored. 
and the rate again determined during the next hour. This procedure was repeated 
several times. The results showed that whereas the three days’ continuous exhaustion 
at 220 nad greatly diminished the catalysing power of the surface, it was subsequently 
^ eiy rapidly restored as the combination of the gases proceeded. The conditions 
under winch this experiment was performed leave no room for doubt but that this 
iapid stimulation of the surface was due to the progressive condensation of one or 
other of the reacting; g;ases. 
© © 
Experiment VI. 
June 18, 1905. 
Normal electrolytic gas. 
Interval. 
Pressure fall. 
* 
hours. 
millims. 
0 to 1 
From 510 • 1 to 497 • 1 
0-0122 
1 2 
X J, -J 
„ 510-1 „ 475-1 
0-0309 
2 „ 3 
„ 509-3 „ 443-0 
0-0614 
3 „ 4 
„ 510-0 „ 421-0 
0-0832 
The two following experiments (Nos. VII. and VIII.) were made with an original 
mixture corresponding very nearly to 3H 2 +0 2 . In each case, the activity of the 
surface was greatly stimulated by the increasing excess of hydrogen as the experiment 
proceeded. 
Experiment VII. 
June 9, 1905. 
3Ho + 0 2 . 
Experiment YIII. 
June 15, 1905. 
3H 2 + 0 o . 
t. 
p h 2 . 
p o. 
*H, 
l 0 2 . 
t. 
P H, 
p o. 
*H„ 
*0 2 . 
hours. 
millims. 
millims. 
hours. 
millims. 
millims. 
0 
373-7 
124-6 
— 
— 
0 
383-0 
127-6 
1 
322-4 
98-9 
0-0640 
0-1003 
1 
292-8 
83-5 
0-1137 
0-1842 
2 
259 ■ 4 
67-4 
0-0758 
0-1334 
2 
203-9 
38-1 
0-1367 
0-2620 
3 
180-2 
27-S 
0-1055 
0-2172 
Ol 
169-1 
20-7 
0-1420 
0-3156 
4 
135-6 
5-6 
0-1100 
0-3391 
1 
3 
144-4 
8-4 
0-1412 
0-3904 
