Dr. Ure on Chloride of Lime. 7 



" So that rather more than half of the powder consisted of 

 pure subbichloride of lime, while the remainder consisted of 

 matter of no efficacy for bleaching *." The specimen thus exa- 

 mined he regards as having possessed extraordinary bleaching 

 strength, " most probably owing to its having been taken from 

 the surface of the lime exposed on the bottom of the receiver, 

 which is always much nearer a state of saturation than any 

 other portion of the powder t." " But I have likewise," adds 

 he, " subjected to analysis a quantity of bleaching-powder, 

 which I have reason to believe constitutes a pretty fair speci- 

 men of the average strength at which this powder is usually 

 exposed to sale. We find it constituted as follows : — 



Subbichloride of lime . . . . ^^•^^| 22 23 lime 



Muriate of lime 18.50 



Water 16.93 



Uncombined lime 28.05 



100.00 J." 



Mr. Dalton's first, or commercial oxyiiiuriate of lime, con- 

 sisted of, 



Suboxymuriateoflime . . . 44.5^^-^ j^j^Jf™- ^'^'^ 



Muriate of lime 1 3.5 



Water 42.3 



iooTo 



His second, prepared by Dr. Henry, contained, he says, no 

 muriate of lime. It consisted, as formerly stated, of 



Oxymuriatic acid 23.2 



Lime 38.4 



Water 38.4 



100.0 



* Annals of Phil. XV. p,407, t IHdtm, loco citato. 



X Ibidem, p. 408. 



