THE 



QUARTERLY JOURNAL, 



Ajml, 1822. 



I 



Art. I. On the Composition and Manufacture of Chloride 

 or Oxymuriate of Lime, (commonly called Bleaching- 

 Powder,) and on the Atomic Weight of Manganese. By 

 Andrew Ure, M.D., F.R.S., ProfessoroftheJnder- 

 sonian Institution in Glasgow, 8fc. 



X HE pulverulent oxymuriate, or chloride of lime, a com- 

 bination equally interesting to science, and important to the arts, 

 was first invented by Charles Tennant, Esq., an ingenious and 

 extensive manufacturing chemist in Glasgow. His patent right 

 to the exclusive preparation of oxymuriate of lime, was granted 

 in 1799. On this curious compound several memoirs have 

 been written, besides the specification of the p^-ocess for mak- 

 ing it, given in the patent. The first author, who treated the 

 subject methodically, was Mr. Dal ton, who wrote a paper on 

 it in the first Number of the Annals of Philosophy ; and ano- 

 ther, which forms the second article of the second volume of 

 that periodical work. His first memoir is occupied with a 

 specimen of bleaching-powder from Mr. Tennant, which was 

 possibly somewhat altered by carriage to Manchester, and 

 keeping. In the second memoir, he examined a portion of 

 oxymuriate of lime, recently prepared by Dr. Henry, by pass- 

 ing chlorine over proto-hydrate of lime, till it was saturated 

 with the gas. Mr. Dalton found this chloride to consist of 23 

 oxymuriate of lime, 38 lime, and 39 water in 100 parts. " Re- 

 ferring now the " atomic system," says this ingenious philoso- 



voL. xni. B 



