44 O^ THI HTfEltOXIMrRIATE OF POTABlli 



he must account for mariatic acid being a supporter of 

 combustion when combined with a stng/e proportion of 

 oxigen, and a nonsupporter when combined with a double 

 proportion, and for a variety of oth€r aworaalie*, which it 

 is needless to mention. 



1 am> Sir, with great respect. 



Your humble servant, 



J. DAW. 

 London, March the 15/A, 1811. 



Til. 



An Attempt to answer the Queries proposed by F. D. in 

 the Journal for April last : />y William Crane, JSjj. 

 F. R, M. 5. Edinburgh 



To Mr. T^ICHOLSON. 

 SIR, 



Ouejtionscn jt\. Correspondent, in your Journal for April, has in a 



o/h p€KaU*° P^P^'^ *>" ^^^ production of hyperoxiaiuriate of potash &c, 



muriate of pointed out some errours, into which Mr. Davy has fallen, 



potash. jjj accounting for the formation of muriate and hyperoxi- 



moriate of potash ; also respecting the formation of muriate 



of ammonia and oxide of tin, on the addition of water and 



ammonia to the fuming liquor of Libavius. 



He observes, that, " when the oximuriatic acid comes 

 into contact with the oxide of potassium, we must suppose, 

 that part of it from superior affinity displaces part of the 

 oxigen, and combines with the potassium'*. He then pro- 

 poses the following questions :— " How shall we in the first 

 place account for this partial action? If a superior affinity 

 exist between part of the oximuriatic acid and part of the 

 potassium; how is it, that it does not subsist between the 

 whole? How is it, that the whole oxigen of the potash i» 

 not set free, and the combination consist of muriate of potash 

 Partial r^ecom- «nly ?" In answer to these question*; it may be observed, 

 positions take that there are many phenomena in chemistry, where a partial 

 aikirf? *^ *' decoipposition only takes place, as has been noticed and 

 explained by Bertholiet in his Chemical Statics. 



His 



