402 Experimenli relative to Ihe Aciion of Hydrochloric Acid 



excepting the Newcastle coal-strata, which was from inforniatiou 

 and sections sent me from my friend Mr. Thomas Fenwick of 

 Dipton. 



I bea; leave further to add, that I hope Mr. Winch will allow 

 that mine is tlio first attempt to form a connexion between the 

 Newcastle coal and the metalliferous limestone formations; which 

 I trust on examination will be found to be an approximation tu 

 truth. 



By inserting the above in your valuable Magazine, you will 

 much oblige, 



Sir, your most obedient, 



Garrigill Alston Moor, May !27, 18 ir. WestGARTH FoRSTER. 



XCI I. r,3rpirime?ils relative to the Action of Hydrochloric Acid 

 upon Mixtures of Tin and Antimony. By M. Cuaudet*. 



-L HE very lively action which hydrochloric acid exerts when 

 brought in contact with tin, com|)ared with the almost insensi- 

 ble influence which it has upon antimonv, led M. Thenard to 

 think that it might be employed as a means of separating these 

 two metals when found in union ; but the experiments which he 

 made, with this object, were not attended with the success he 

 anticipated. 



Having procured tin and antimony in as pure a state as pos- 

 sible, I began by examining the action of hydrochloric acid on 

 these two metals taken separately. 



I flattened, to about the thickness of a centime, a portion of 

 the tin, and put it into a phial, into which I afterwards intro- 

 duced a certain quantity of hydrochloric acid perfectly pure, the 

 specific weight of which was 1190, and which marked 22" 

 on an areometer of Baiune's. At the end of six hours the dis- 

 solution was perfectly complete. 



On applying a slight boiling heat to the same mixture, the dis- 

 solution was completed in one hour. 



I then pounded 100 parts of antimony to a fine powder, and 

 put them into a phial with a quantity of hydrochloric acid. 

 After remaining twenty-four hours in a cold place, I found that 

 90 parts of the antimonv remained at the bottom of the vessel, 

 and that only four parts had dissolved f. 



A like 



* From tlie Annates dc Ctiimie et de Ptii/sique for December 1816. 



+ After beinu; some hours in the glass, tlie liquor which was at first while 

 bc<:amc yellowish. On shaking the glass this colour disappcsred, but re- 

 lumed in a few hours after: the glass being again shaken, the colour aj;;iiii 

 disappeared;— and as often as the same operation was repeated alike rcMik 



followed. 



