192 Wells and Willis — Chlorides of Ocesium and Thorium. 



3 : 1 Ccesium-thoriiim chloride, 3CsCl*ThCl 4 *12H 2 0.— This 

 salt was produced from solutions containing about 12 g of 

 thorium chloride and from 30 to 110 8 ' of csesium chloride. 

 It forms colorless crystals of feathery structure upon cooling 

 very concentrated solutions. Three different crops made 

 under somewhat varied conditions gave the following results 

 upon analysis : 



Calculated for Found. 



Cs 3 ThCVl2H 2 0. I. II. III. 



Caesium 36'45 36*21 36*14 



Thorium 21*20 20*70 21*68 21*05 



Chlorine : 22*61 23*09 23*37 



Water 19*74 [20*00] 



2 : 1 Ccesium-thoriiim chloride, 2CsCl-ThCl 4 *llH 2 0.— This 

 salt was obtained in colorless crystals, somewhat resembling 

 the previous salt, but not nearly as feathery in appearance. It 

 was formed in concentrated solutions containing about 65 g of 

 thorium chloride and from 30 to 100 g of caesium chloride. 

 The following analyses were made of different crops : 



Calculated for Found 



Cs 2 ThCl 6 .llH 2 0. I. II. III. IV". 



Caesium 29*26 29*84 29*10 28*92 



Thorium. 25*52 25*42 25*41 25*70 25*22 



Chlorine 23*43 23*40 24*75 23*35 23*55 



Water 21*78 [21*34] [20*74] [22*03] 



The salt loses water slowly in the desiccator over sulphuric 

 ^cid. A sample dried in this way lost 6 per cent in two days, 

 11 per cent after one week, and 20 per cent, corresponding to 

 practically all the water, after one month. 



The two chlorides that we have obtained are different in 

 type from the potassium salt KCl*2ThCl 4 , 18H 2 described by 

 Cleve* and from the ammonium salt 8NH 4 Ci*ThCl 4 *8H 2 6 

 described by Chydenius.f It seems certain that the ammo- 

 nium salt just mentioned represents a mixture, for it is 

 described as a sintered mass made in the dry way. 



Sheffield Scientific School, May, 1901. 



* Bulletin, xxi, 118. f Pogg. Ann., cxix, 43. 



