66

plied to the same point of the copper cup,the bottom of which was wiped after eachexperiment.

The results were as follows:

The flame from olefiant gas raised the " 0thermometer to - 270

---hydrogene - - 238

-sulphuretted hydrogene 232

-coal gas - - 236

-gaseous oxide of carbon 218

The quantities of oxygene consumed (thatabsorbed by the hydrogene being taken as 1)Would be, supposing the combustion perfect,for the olefiant gas 6, for the sulphuretted hy-drogene 3, for the carbonic oxide 1. Thecoal gas contained only a very small propor-tion of olefiant gas; supposing it to be purecarburetted hydrogene, it would have con-sumed 4 of oxygene. Taking the elevationsof temperature, and the quantities of oxygeneconsumed as the data, the ratios of the heatproduced by the combustion of the differentgases, would be for hydrogene 26, for olefiantgas 9.66, for sulphuretted hydrogene 6.66,for carburetted hydrogene 6, for carbonicoxide 6*.

* These results may be compared with, Mr. Dalton’s