J. P. Cooke on Stibiotrizincyle and Stibiobizincyle. 229 
L. Ul. 1, Iv. v. Vi VIL. 
Found, 96:75 98:13 9682 100-00 96:42 9858 99-50 
Difference, 3:25 187 318 -—— 3°58 142 050 
Léwe’s own analyses prove then that in point of accuracy the 
method leaves much to be desired; while by his inconsiderate 
manner of stating his results he has deceived himself, and proba- 
bly many others. 
New York, June 18th, 1854. 

Arr. XXIX.—On Sitibiotrizincyle and Stibiobizincyle, two new 
compounds of Zinc and Antimony, with some remarl:s on the 
decomposition of water by the alloys of these metals; by 
ostan P. Cooke, Jr., Cambridge. 
Durine some experiments on Antimoniuretted Hydrogen, made 
the last winter, I noticed that the alloys of zinc and antimony, 
which had been used for preparing that gas, continued to evolve 
gas from pure water, even after they had been washed complete- 
ly free from the dilute acid employed in the process. This gas 
Proved to be pure h ydrogen, and on boiling the washed alloy with 
water, I found the evolution so rapid as to recommend the reac- 
tion as a process of preparing hydrogen in a state of purity. 
This fact was announced at the last meeting of the American 
Association for the Advancement of Science; the new process of 
Preparing hydrogen described, and proofs given of the purity of 
the gas thus obtained. : 
n investigating this unexpected reaction, I found that not 
only the alloys of zine and antimony, but that also pure zinc 
80nd article of commercial antimony which contained rather over 
one per cent. of impurities. ‘The antimony contained in the al- 
loys is therefore to be rated at somewhat less than that given in 
the table according to the per cent. of antimony which the alloys 
contain. The two metals having been accurately weighed out, 
Were melted together in clean crucibles and the alloys granulated 
*8 nearly as possible under the same conditions. ‘T'wo hundred 
