Wells and Campbell — Double Chlorides, etc. 431 



. H o 0. 



Caesium 20*89 



Cadmium 17*13 



Iodine 59*21 



Water 2*88 



Found. 



Calculated for CsCdl 



20-75 



. _ _ . 



20*66 



17*43 



17*89 



17*39 



59*18 







59*16 



2*80 



2*76 



2*79 



100*11 100*16 100*00 



Sheffield Scientific School, 

 New Haveu, Conn., August, 1893. 



Art. LYIIT. — On the Double Chlorides^ Bromides and Iodides 

 of OcBsium and Zinc, and of Coesium and Magnesium y 

 by H. L. Wells and G. F. Campbell. 



The csesium-rnercuric and the caesium-cadmium lialides have 

 already been studied in this laboratory, and it has seemed de- 

 sirable to extend the investigation to the zinc and magnesium 

 compounds, thus completing the study of the caesium double 

 halides of this family of bivalent metals as far as the chlorides, 

 bromides and iodides are concerned. 



We have obtained the following salts : 



3 : 



Ce 

 Ce 

 Ce 



1 Type. 

 3 ZnCl 5 

 3 ZnBr 5 



;zm 5 



2: 



Cs 



c* 



Cs 



1 Type. 

 2 ZnCl 4 

 2 ZnBr 4 



2 ZnI 4 



1:1 Typ 

 9 

 9 

 9 



CsMgCl, . 

 OsMgBr, 



e. 

 6HO 









. 6H O 













A systematic and thorough search has been made in all cases, 

 and it is remarkable that while mercury gave six types of 

 caesium double salts and cadmium gave three, only two could 

 be obtained with zinc and one with magnesium. It is evident 

 that the variety of these double salts increases with the atomic 

 weight of the bivalent metal. The existence of zinc salts of 

 the 1 : 1 type is suspected, but the suspected products were 

 obtained only in extremely concentrated zinc halide solutions 

 of such a syrupy nature that no satisfactory analyses of them 

 could be made. 



The previously described double halides of zinc and mag- 

 nesium with the alkali-metals, as far as we have been able to 

 find them, are given below : 



