416 Scientific Intelligence. 
bonic oi oy or ; the chlorid of calcium serves to prevent the escape a 
of wa 
When a current of oxygen is used to complete the combustion, it is 
necessary before weighing to fill the tubes with oxygen. If in the pro- 
ess of the analysis, the sulphuric acid becomes brown, it may 
eae that volatile carburets of hydrogen have esvaped combustion. 
author asse this may be completely avoided by filling the 
combustion tube a with oxyd of a and by not making @ 
canal for the esca the gases as is usually do don Numerous analyses 
show that the ocmee is capable of giving a ‘satisfactory pares 
Zeitschrift fir Analytische Chemie, i, p. 2 
7. On the determination of lithium as phosphate of lithia, ae 
finds ehiyt lithia may be determined quantitatively in the form of phos- 
ee aceording to the method proposed by Mayer, Aw eighed quantity 
ure carbonate of lithia was dissolved in dilute sulphuric acid, the so- 
futon eva store the residue pearly nited, dissolved in a little van 
again evaporated, and the residue — as before, whereby 4 > arher 
is process 
long as weighable yn cies ie Phosphate of eo a ‘1 
aeaee engra ques. 
Claremont, N. H., 1861.*—These two handsome, well printed sone 
illustrated volumes, are devoted to the elucidation of the geological a 
ture and economical resources of a highly interesting and difficult wef 
_ constitute a very important work for which all will feel Ker i, 
a i er the excellent geologists whose labors are recorded 
8 of this Report may be procured by writing to A. D. Hagen ee ie 
oa 
