Prof. J. W. Mallet on the Atomic Weight of Lithium. 351 
sulphate of baryta precipitated, we are not certain that 
Weight of the latter really corresponds to the quantity of sul- 
take the sulphates of two very similar and closely related bases, 
itis probable that the difference in the amount of error will be 
Very small. These considerations have led to the followi 
method for determining the equivalent of lithium. 
Portions (A, 1, and 2,) of this salt were rendered anhydrous ny 
Cautious application of a heat below redness, and accurately 
Weighed. Two similar portions of perfectly pure sulphate of 
soda (B, 1, and 2,) were dried and weighed with equal care. 
And, lastly, two portions of pure sulphate of magnesia (C, 1, and 
2,) were in like manner due and weighed. Soda and magnesia 
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