Chemistry and Physics. 59 
that is, forming layers less and less dense, starting from the sur- 
face of the metal. Consider now what takes place when sulphuric 
nary hydrogen in the liquid condition. The amount of heat dis- 
engaged by this change is so great that the calorimeter shows 
about 4,600 units, notwithstanding the absorption of heat due to 
the passage of the hydrogen so formed from the liquid to the gas- 
eous state. 
ed. 3d. Passage of the vapor of water to its liquid condition.— 
Comptes Rendus, 656, Sept. 22d, 1873. o. P, 
0. A new Thermo-Electric Buttery—M. CiraMon 
structed a new form of thermo-electric battery, which gives a near} 
age of the electric current finally decomposes 
the galena ; hence a change takes place in the structure of the bars, 
their interior resistance increases, and the electro-motive force 
decomp: in streaks, and con- 
sarap t : i tak lace in the 
Sequen y after some time unequal ee ase In 
tteries these difficulties are completely ¢ eer 
new 
chemical and molecular condition of the bars remaining absolutely 
* 
