wt 
8. P. Sharples on a new Salt containing Cesium, etc. 179 
spectroscope showed only faint traces of the other metals of the 
alkaline group. : 
he crude salt was dissolved in a large quantity of water to 
which some chlorhydric acid was added and the solution evapo- 
rated until crystals began to form on the surface of the liquid. 
It was then allowed to cool and the resulting crystals filtered off, 
washed with chlorhydric acid and dried. They were then found 
to be entirely free from even traces of the other alkalies. Two 
_ Separate portions of the crystals were weighed out and treated 
} with dilute nitric acid, which on boiling precipitated the tin 
} completely as Sn0,; this was filtered off and the chlorine deter- 
_ mimed as chlorid of silver. In the first analysis 4105 gram 
| of the salt gave -1004 grams of Sn@, and ‘5844 grams of AgCl. 
= Inthe second, -4767 grams gave ‘1169 grams of Sn, and ‘6727 
grams of AgCl or in per cent— 
L 
ge Calculated. 
Cl 35°22 34°91 35°84 
Sn 18°12 18°18 19:49 
Cs by dif. 46°66 46°91 44°67 
4 This it will be seen corresponds very nearly to the formula 
f 520s, Cl,, so that the salt is analogous to the well known pla- 
+ co aaa PtCs,Cl,. Like this it crystallizes in the regular 
BF system 
Tn order to ascertain whether the salt might be made use of 
for detecting cesium in minerals, three or four grams of Hebron 
epidolite were fused with about their own weight of carbonate 
of soda and treated with HCl to remove the silica. To the 
; Preparing th ot eee Zz be 
tation of the metal in the form of chloro-stannate appears to “ 
Cambridge, Dec. 31st, 1868. 
