8^8" Chemical Notices. 



late of potafli treated in the fame manner gives a fimilai' 

 refult. Charcoal mechanically joined to potafh do^ not 

 produce the effeft. 



C. Haiiy has obferved that native fulphur, of which fome; 

 kinds are very tranfparent, pofleflTcs the property of double 

 refraction. 



C. Cadet having mixed the materials to be employed in? 

 producing fulphuric ether, "jiz. alcohol and fulphurrc acid^ 

 and fet them by in a cool place clofely corked up in a bottle^ 

 at the end of 30 hours found the bottom of the vefTel covered 

 with well-formed'cryftals of oxalic acid. 

 -\C. Badollier, apothecary at Chartres, has ailnouticec^ a 

 TiCW method of preparing acetic acid. It confifts in diilill-\ 

 ins;, in a retort placed in a fand bath with a receiver adapted 

 U) \i, a mixture of equal parts of fulphate of copper and ace-,, 

 tate of Tead. 



To examine the produfts, C* Badolller made ufe of a 

 pneumatic apparatus : during the operation he obtained only- 

 a fmall quantity of elaftic fluid, which he found to have arifea 

 from the dilated air contained in the veflels. This air, whei^ 

 fubje<Sled to the proper re- agents, exhibited no traces of car-, 

 bonic acid. As he prefumed that his acetic acid might 

 contain fulphuric acid, he tried it by means of a folution of 

 muriate of barytes, which occalioned no precipitate. 



It is to be remarked that the diftillation takes place very 

 rapiddly and with a very moderate fire ; that the acid obtained 

 by this method has no empyreumatic odour ; that it is in- 

 ferior neither in, quantity nor quality to that obtained by the 

 acctite of copper; and that there is no portion of the acid 

 decompofed, which communicates to the other a difagree- 

 able odour, as is the cafe when the old prdcefs is ufed. Be- 

 fides the faving in time and fuel, the acid prepared by this nievv 

 method can be fold for one fourth of that prepared by diftill- 

 ing acetite of copper. 



We confefs that we cannot fee much difference between 

 this and the old procefs ; for it has been long known that 

 fulphate of copper and acetate of lead mutually decompofe 

 each other, and form fulphate of lead and acetate of copper. If 

 heat be applied, the latter, of courfe, will part with its acid. . 



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