352 J. W. Mallet on the Atomic Weight of Lithium. 
Authority. Salt analyzed. At. Weight of Li. 
Arfwedson Ist experiment,| Sulphate. 129°30 
2nd "I g 135°22 
- Sed Chlorid. 12671 
Vauquelin, Sulphate. 11617 
Gmelin Ist . s 135°54 
" fod 6% Sulphate conv. into Carbonate. 108'22 
Stromeyer, Sulphate. 122°74 
Kralovanszky, me 13140 
Hermann list “ Carbonate. 75°97 
* Sulphate. 75:82 
we: * . 75°67 
Berzelius 1st “ Carbonate conv. into Sulphate. 80°89 
« a Sulphate. 83-01 
Hagen, = 82°41 
Of th 
Vauquelin, Gmelin, Stromeyer, and Kralovanszky are at once 
ee salt of lithia, but a mixture of salts of lithia and soda. 
sult has been generally taken of late years as the true one, and 
with it that of Hagen agrees pretty well. 
e have thus the atomic weight of Lithium as the result of 
but two experiments, agreeing, it is true, fairly with each other, 
but both made by the same process—the precipitation of SU 
phate of lithia by a salt of baryta, washing, igniting, and weigh- 
ing the BaO,SO, produced. And as it is well known that sul- 
phate of baryta is washed with extreme difficulty, an excess of 
of the sulphuric acid difficult; and as the quantity of sulphate 
of lithia submitted to analysis in each of these experiments was 
t small, and therefore the effect of any trifling error in the 
estimation of the sulphuric acid would be more seriously felt— 
it seemed that the equivalent of the metal might be redetermined 
eS — > Aa eee 
