AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
Art. VIII.—Notice of Julius Thomsen’s Thermochemical Investi- 
gation of the Molecular Structure of the Hydrocarbon Compounds ;* 
by Jostan P. Cooke. 
sulphur, 64 grams of oxygen gas, and 2 grams of hydrogen gas 
(both gases taken in their ordinary state under the normal con- 
ditions of temperature and pressure), when united to form 98 
grams of sulphuric acid, volte sufficient heat to raise the tem- 
perature of 193,000 grams of water one degree. It must be 
noticed that our experiments only prove that in passing from 
the elementary substances to the ultimate product through the 
intermediate stages, which the production of sulphuric acid 
* Berichte der deutsch. chem. Gesellschaft, xiii, 1880, pp. 1321, 1388, 1806, 
Am. Jour. oe Series, VoL. XXI, No, 122.—Fxs., 1881. 
