200 
the apparatus requires no further attention until the combustion is ended. 
If the inflow of combustible gases much exceeds the rate prescribed, 
a series of small explosions is likely to occur at the juncture of the capil- 
lary side-arm with the pipette, traces of carbon deposition are evident and 
the results are slightly low. 
Some analyses of acetylene and explosive mixtures of acetylene with 
air are appended : 
: | ' After } Og Con- FS 
Exp. No. | C2Ha, ec. Ho, ee. Og, ce. Res. cc. KOH ee. CO2, ce. suiedveen CoH, %. 
- =r ! 
1 20.0 30.0 | 80.0 55.0 15.0 40.0 65.0 100.0 
2 10.0 30.0 | 54.2 34.3 34.2 20.1 40.0 100.5 
3 2.0 50.0 | 52.6 26.8 22.8 4.0 29.8 100.0 
4 30.0 30.0 100.0 70.3 10.8 59.5 89.2 99.2 
5 30.0 15.0 100.0 18 18.4 59.4 | 81.6 99.0 
6 15.0 | 30.0 69.0 46.6 16.6 30.0 | 52.4 100.0 
7 15.0 | 30.0 70.0 47.4 17.4 30.0 | 52.6 100.0 
8 10.2 | 25.0 50.9 33.4 13.0 20.4 | 37.9 100.0 
Explosive mixtures of air and acetylene: 
| 
1 | 15.0 30.0 5 35.2 13.4 BU Be centre tere 72.6 
2 15.3 30.0 51.0 34.6 12.5 7a! ila (AE ee a 8 72:2 
Absorption by fuming sulphuric acid gave 72.0% and 72.3%. 
Purdue University, 
Lafayette, Ind. 
