IN GASES: HYDROGEN, CARBONIC OXIDE, AND OXYGEN. 
6GI 
my experiments. The number found. (a=5) is considerably below the maximum 
observed by Horstmann. To observe the effect of an increase of oxygen, a second 
series of experiments was made similar in all respects to the first, but with 17’7 
volumes of oxygen instead of 14 - 2 added to 100 volumes of the combustible gases. 
The gases were exploded under 1000 millims. pressure in each experiment. 
Table XXVII. 
Reference 
Temperature. 
Before the explosion. 
Coefficient a. 
No. 
Oxygen. 
Carbonic oxide. 
Hvdrogen. 
79 
° C. 
13-4 
177 
83-9 
16-1 
4-8 
80 
13-4 
79-8 
20 2 
5-0 
81 
12-6 
78-2 
21-8 
49 
82 
136 
99 
687 
313 
5-3 
83 
13-0 
99 
45'4 
54-6 
5-2 
84 
13-2 
35-9 
64-1 
5-2 
85 
137 
99 
15-8 
84-2 
5-0 
Mean 13*3 
Mean 5'06 
These experiments entirely confirm the previous series ; the proportion of gases 
burnt is expressed by the equation 
k'xh 
kxh~ a 
and the mean value of a closely approximates to the value previously found. No 
appreciable rise in the coefficient is produced by increasing the amount of oxygen from 
14‘2 to 17'7 volumes. These experiments are therefore at variance with Horstmann’s 
conclusion. 
To test this point further a mixture was made containing 15‘9 vols. of oxygen to 
100 volumes of the combustible gases. Two experiments were made with portions of 
this mixture ; then more oxygen was added to the remainder and two more experiments 
made. 
Table XXVIII. — Pressure = 1000 millims. 
Reference 
Temperature. 
Before the explosion. 
Coefficient a. 
No. 
Oxygen. 
Carbonic oxide. 
Hydrogen. 
86 
° C. 
67 
15'9 
732 
26'8 
57 
87 
8-9 
99 
5 ? 
99 
5'6 
88 
8-8 
24-3 
732 
26-8 
5'6 
89 
8-0 
99 
99 
99 
57 
Mean 8'1 
Mean 5'6 
