Chemistry and Physics. . > 421 
quichlorid of iron. The solution of the sesquichlorid must be acidula- 
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the electromotive force was 1°3958. From these results it is clear that 
the chlorid of iron battery stands between Bunsen’s and Daniell’s in 
point of constancy. has greater power and constancy than Daniell’s 
while it is perfectly free from the offensive vapors which render the use 
of the nitric acid batteries so annoying.—Ann. der Chemie und Phar- 
« €, Xcil, 2 ym : 
« . [Note.—Would not the solution of the sesquioxyd of iron which is 
* obtained by the. spontaneous oxydation of a solution of green vitriol in 
air answer the above purpose as well as the sesquichlorid? Its con- 
ducting power would in all probability be much better and it would cer- 
tainly be cheaper. Moreover the protosulphate of iron formed by the 
reducing process in the battery might be exposed to the air a second 
ume and thus reoxydized and again employed.—w. ce. ] 
_ 8. On the law of the absorption of gases.—Bunsen has communicated 
_ & most admirable and elaborate investigation of the subject of the ab- 
» » Sorption of gases by liquids. As however it is impossible to do it jus- 
lee by any abstract, we must refer our readers to the original paper in 
| the Ann. der Chemie und Pharmacie, xciii, 1, Jan., 1855. 
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the pressure will become (1-+-a) H 
Tf we give this air the heat p ¢ without permitting it to expand, the tem- 
where a is the coefficient 000367 If we then open a communication 
