124 Scientific Intelligence. 
drie acid free hydrogen and protoxyd of silicon. 
succeeded in isolating a lead-grey aggregate of regular octaledrons, some 
times presenting cubie surfaces. These were found to have the formula 
g2 Si, and as this compound yielded the spontaneously inflammable gas 
with chlorhydric acid, it is possible that the formula of this latter may 
be SiH2. Martins is engaged in studying the subject further—Ann.@ 
Chemie et de Physique, liv, 218, Oct. 1858. a 
[Note.—It must be remembered that Wohler and Martins take the — 
14, as appears necessary, since Marignac has shown the isomorphism ¢ a 
the fluosilicates and fiuostannates. It is very much to be desired that 
those chemists whose means enable them to make such researches, should 
investigate the compounds of silicon with ethyl, methyl, &e. It cam 
silicon, a compound of ethyl! and silicon having the formula Si(C4 
since we should have a reaction expressible by the equation ae 
2. Zn(CaHis) + Si Cle = 2Zn Cl + Si(CaHs)2. ce 
A determination of the density of the vapor of ethyl-silicon would por 
sess much theoretical interest. The results obtained by Hoffmann and 
Cahours in the formation of compounds of ethyl, &c., with phosphorus _ : 
and arsenic render the existence of similar compounds of silicon and borol 
almost certain.—w. G. ; 
bing WO 
alcohol 4 
0) 
iInercury volumetricaily, Hempel gives the following process, which yet 
results. The solution of the chlorid, nitrate or sulphate © 
mercury (in the two last cases chlorid of sodium must be added,) 1s © © 
introduced into a capacious flask with a ground stopple, an excess of | 
