J. P. Cooke—Atomic Weight of Antimony. 45 
of sublimation. Were we to repeat the investigation with our 
— knowledge, we should follow the indications of these 
ast analyses; and instead of attemping to make the two chief 
errors as small as possible, and balance them, we should seek 
to remove from the solution all the free hydrochloric acid, and 
thus eliminate the error due to the occlusion of oxichloride. It 
would then, of course, be necessary to determine in all cases 
the carbonaceous residue, which might however be very large, 
without impairing the accuracy of the result. Still, our experi- 
ence with shea antimony determinations would lead us to fear 
that we might thus raise up as many hindrances as we avoided, 
and the determination we have given as No. 13 is sufficient for 
all purposes of comparison. 
his point in our investigation was reached in the spring of 
1876, and the results given above were presented to the Ameri- 
can Academy of Arts and Sciences at their meeting of June 
14th, 1876. But although they agreed so closely with the 
results of Schneider, and although the close confirmation of his 
analysis thus furnished by our synthesis seemed so conclusive, 
ier we could not rest satisfied so long as the great discrepancy 
tween this value of the atomic weight and the higher number 
obtained by Dumas remained unexplained. We therefore 
chloride, and the r are united in the following table. 
Beginning with crystallized chloride of antimony obtained from 
different dealers, an in a commercial sense, we first 
further peso by repeated crystallizations from fusion. As 
e 
latent heat), it is easy to arrest the process at any point, and 
ed off the still liquid portion from the erystals which have 
iormed. The 
