a 
Prof. J. W. Mallet on the Atomic Weight of Lithium. 349 
of Deville and Troost on the vapor-density of chlorid of zirco- 
nium, which appears to have the formula Zr(l,, analogous to 
TiCl, and SiCl 
pared from ammonia or cyanogen at least, its nitride burns when 
Art. XXXVIL—On the Atomic Weight of Lithium; by J. W. 
Matter, Prof. Chemistry in the University of Alabama. 
(Read before the Amer. Assoc, for the Advan. of Science, Aug. 1859.) 
that the equivalent of lithium, which has been usually taken, on 
elius, as 65 (=81-25 on the oxygen scale), 
or 6°6 (=82°50), is in fact considerably higher, and may be as- 
._ My own results were obtained by the method used by Pelouze 
in determining the equivalents of sodium and barium, namely, 
the precipitation of chlorid of lithium by a solution of silver of 
Known Strength. In this way the equivalent of lithium Was 
found by three experiments =86'93, 86°96, 86°45, or in the mean 
86-78 (or 6-95 as referred to the hydrogen unit). ‘es 
_ Since the publication of the above result, it has_ m..GOn- 
firmed by Dumas, who, in one of his recent papers on the equiv- 
alents of the elements, states that he has found that of lithium 
* Ann. d. Chem. a. Pharm., Mai, 1856, 5. 140, + Ibid, Feb, 1858, 8. 259. 
+ Ibid, Mai, 1859, S. 249 
