232 WANT OF TABLES OF THE PROPORTIONS OF SALTS, 



XIV. 



On the Want of Tables of the Proportions of the constituent 

 Principles of Salts, and on the Luminous Smoke from 

 Lead Smelting-Houses. In a Letter from a Correspon- 

 dent. 



To Mr. NICHOLSON. 



Sir, 



Tables of the •**" HERE are few tables more useful to a chemical in* 

 proportions of quirer, than such as point out the proportions of the consti- 



ent Twof" tuent P arts of salts: not onl y tlle philosophic but the prac* 

 salts would be tical chemist also would be equally benefited, by having a 

 ighly useful. co ji ec ti on f tables of this description to refer to; and it is 

 I think a matter of surprise, that no person has attempted to 

 publish such upon a scale sufficiently extensive, to answer 

 the purpose of general reference. I was in hopes, that the 

 last edition of your Dictionary would have contained, among 

 its other valuable additions, tables of this kind* ; and it may 

 not perhaps be improper to suggest, that this omission may 

 in some measure be supplied by inserting from time to time 

 in your interesting journal, as opportunity of collecting the 

 requisite materials may afford, an alphabetical list of salts* 

 vith the proportion of their ingredients agreeably to the 

 latest researches. Such an addition, while it would render 

 an essential service to many pf your readers, would not a lit- 

 tle increase the value of your Journal. 

 Luminous * have observed, that the white smoke that arises from a 



smokefrom ] ea d furnace during the process of smelting the ore continues 

 ore* '"* e luminous at night for a great length of time after it has left 

 the chimney: sometimes I have seen the smoke retain this 

 luminous appearance until it has been quite dissipated. 

 Your explanation of this phenomenon will oblige. Sir, 

 Your most humble Servant, 

 May 6/A, 1S09. J. S. K. 



• In table II at the ond of the Dictionary that of Compounds consist. 

 ing in general of more than twoPrincipIe.", the propoitions,uhere they had 

 been ascertained with.any accuracy, were given from the best authorities. 



lam 



