10 Dr. Ure on Chloride of Lime. 



end of that period, to be only 30 grains, which subse- 

 quent examination shewed to be due to a little hydrated chlo- 

 ride ; the few grains of water requisite having been derived from 

 the great body of undried gas which had been transmitted. In 

 May 1817, an experiment is recorded, in which 400 grains of a 

 hydrate of Carrara lime, equivalent to 291.28 grains of dry 

 lime, were exposed for two days to a stream of chlorine, washed 

 in water of 50°, and refusing to absorb more gas, were found 

 heavier by 270.5 grains. Supposing this augmentation to be 

 chlorine, we shall have the composition of the powder, by the 

 synthetic mode, as follows : — 



Chlorine 40.34 



Drv lime 43.46? 



Water . 16.20 S "y^^'^^^ • ^9.66 



100.00 



This powder was analyzed, by acting on a given weight of it 

 with dilute muriatic acid, in a pear-shaped glass vessel. Care 

 was taken to remove the whole disengaged chlorine, without 

 letting any liquid escape. The lime was converted into car- 

 bonate, by a solution of carbonate of ammonia. The following 

 are the results of two independent analytical experiments : 



100.00 100.00 



I have reason to believe the second experiment the more 

 correct of the two, and if the synthetic result be compared with 

 it, we are led to infer that the very great body of undried chlo- 

 rine passed over the lime had deposited two per cent, of water. 

 By other experiments I satisfied myself, that dilute muriatic 

 acid expelled nothing but pure chlorine, for the whole gas dis- 

 engaged is absorbed on agitation with mercury. It does not 

 appear possible to reconcile the above chlorides to a definite 

 atomic constitution. The following experiments were made 

 with much care last spring : 



