C. U. Shepard, Jr.—A new mineral, Pyrophosphorite. 49 
As they at first repented themselves to us, these new results, 
so far from throwing light on the subject, only rendered the 
problem the more obscure and baffling. Towards interpreting 
value our own spe eriments and those of Schneider might have 
in fixing the atomic weight of antimony, they had at least 
established, SR: all doubt, the proportion of this element in 
the gray sulphide weighed in our antimony determinations. 
For if we assumed, as those experiments indicated, that five- 
sevenths of the gray sulpbide was antimony, then the amounts 
of antimony and chlorine found in the analysis of antimonious 
chloride just made almost exactly supplemented eac 
while on the other hand, if this material was, as generally 
believed, pure Sb,S,, in which Sb:S=122: 32, then our deter- 
minations of one or the other of these elements must be greatly 
erroneous, and the excess obtained far too great to be explained 
y any known or probable imperfections of our Of 
course, although the gray sulphide might contain, on the aver- 
age, five-sevenths of its weight of ne ape it was a possible 
etDpomnos that it rca also occlude a constant amount of 
and taken into the account, and in our later determination even 
this had been reduced to sosmall an amount as to be wholly 
insignificant 
[To be continued. ] 
Art. VII.—On a new ecineral Pyrophosphorite: an Anhydrous 
Pyrophosphate ve Lime from the West Indies ; by CHARLES 
UpHaM SHEPARD, Jr., Professor of Chemistry in the Medi- 
cal College of ne State of South Carolina 
TurovuGu the kindness of Mr. C. C. Wyllie of London, Eng- 
land, I have been put in the possession of a few small fragments 
of a mineral phosphate from a new locality in the West Indies. 
Commercial considerations forbid at present the aes a of 
the precise position of this deposit, but later I hope to 
to announce it, as also to give iatorseten with regard to the 
— amen of occurrence, and so 0 
R. Scr.—TutepD Sees Von. XV, No. * —Jan., 1878. 
