48 J. P. Cooke—Atomic Weight of Antimony. 
obtained by Dumas as closely as did the previous determina- 
tions confirm that obtained by Schneider. Evidently, there 
was a large constant error in one case or the other. Moreover, 
it appeared improbable that in either case any error could arise 
in the chemical process employed: for, in the first instance, we 
had a synthesis by one method confirming an analysis by a 
wholly different method ; and, in the second instance, the analy- 
tical process employed is regarded as one of the most accurate 
known to science, and we had apparent’). shown that its accu- 
racy was not impaired under the peculiar conditions present. 
It appeared, therefore, reasonable to assume that the results did 
truly indicate both the actual proportion of antimony in the 
sulphide of antimony and of chlorine in the chloride of anti- 
mony analyzed, and to look for the cause of the discrepancy to 
some impurity in one or the other compound. e therefore 
next sought to determine how much sulphide of antimon 
could be obtained from a given weight of chloride of antimony, 
hoping that by thus bringing the relations of antimony to 
chlorine and sulphur into close comparison the source of the 
error might be indicat 
The following table exhibits the results of these antimony 
determinations, as well as the general result of the assumed 
complete analysis of antimonious chloride. The per cent of 
chlorine taken is the mean of the first thirteen determinations 
of the previous table, as these only had been made at the time 
the second table was drawn up, and it therefore exhibits the 
results exactly as they were presented to us at this stage of the 
investigation. 
ANALYSIS OF ANTIMONIOUS CHLORIDE. 
DETERMINATION OF ANTIMONY. 
SbCl, taken in Sb,S, obtained ¢ of = irra mem when @ of Antimony if 
grams. in grams. = S=-120: 42.* Sb: S=122 : 32.+ 
15. 3°8846 2°8973 53°275 53°525 
26. 5°1317 3°8417 53°473 53°725 
36, 44480 3°3201 53°316 53°567 
4 b. 506 3°4009 53°882 53°633 
56. 4°8077 3°6072 53°593 53°845 
6 774 3°1958 . 53°367 53°618 
Mean of all Analyses 53-401 53°652 
: MEAN RESULTS OF COMPLETE ANALYSIS. 
Antimony, the mean of six determinations 53°401 53°652 
Chlori «“ thirteen “ 46°611f 46°61 er, 
100°012 100°263 
*Or wie that of the gray sulphide is antimony, as deduced from actual 
> sain generall. pted theory. 
En Oe ee aed 1g=1G8. Cocttaing © Dewie: 
