HYDROGEN AND OXYGEN IN CONTACT WITH HOT SURFACES. 
19 
the hydrogen, was finally confirmed by the two following experiments, in which the 
original mixtures corresponded to approximately TI 2 + 0 2 and 3H 2 + 0 2 respectively. 
The rate of circulation, which was the same in both, was somewhat faster than in the 
three preceding experiments (VII. to IX.). 
Experiment X. 
April 26, 1904. 
Original mixture = H 2 + O 2 . T = 430". 
hours. 
0 
2 
4 
6 
8 
12 
24 
28 
32 
millims. 
398-0 
358-0 
329-5 
294-0 
268- 
228- 
156 ■ 
142-1 
129-0 
•4 
•3 
•9 
' 
P H, 
O 
Ph 
millims. 
millims. 
196-0 
202-0 
— 
169-2 
188-8 
0-0320 
150-2 
179-3 
0-0289 
126-5 
167-5 
0-0317 
109-5 
158-9 
0-0316 
82-7 
145-6 
0-0312 
35-1 
121-8 
0-0311 
25-3 
116-8 
0-0318 
16-5 
112 • 5 
0-0335 
0-0148 
0-0130 
0-0136 
0-0131 
0-0119 
0-0092 
0-0085 
0-0080 
Experiment XI. 
April 29, 1904. 
Original mixture = 3H 2 + 0 2 . T = 430°. 
t. 
P. 
P H, 
p o. 
*Ho. 
hours. 
millims. 
millims. 
millims. 
0 
387-4 
292-5 
94-9 
— 
2 
339-4 
260-5 
78-9 
0-0253 
4 
294-4 
230-5 
63-9 
0-0259 
6 
258-0 
206-2 
51-8 
0-0253 
8 
227-6 
185-9 
41-7 
0-0246 
10 
200-4 
167-8 
32-6 
0-0241 
12 
176-4 
151-8 
24-6 
0-0237 
14 
154-4 
137-1 
17-3 
0-0235 
16 
134-0 
123-6 
10-4 
0-0240 
18 
115-8 
111-4 
4-4 
0-0233 
'O,. 
0-0401 
0-0429 
0-0438 
0-0447 
0-0464 
0-0488 
0-0528 
0-0600 
0-0741 
3rd Group.—Experiments Showing the Stimulating Influence of Hydrogen upon 
the Catalysing Power of the Surface. 
The fact that the rate of combination throughout a given experiment is always 
proportional to the partial pressure of the hydrogen, can hardly have any other 
meaning than that the formation of steam is an indirect process, dependent on a 
primary change, induced by the surface, in which the hydrogen is concerned. This 
d 2 
