METHOD FOR CLOSING WIDE MOUTHED VESSELS. 215 



prefent in the mineral, wili be diflblved*, and the infoluble 

 rcfidue left, is the new earth called Aguftine. 



It is difiinguilhed from all other earlhs hy being abfolutely charaSers of 

 infoluble in polafli, foda, and ammonia, and all their car- ^^'s earth. 

 bonates. Nor can an union of either of the two firft al- 

 calies with Aguftine be effected by fufion. It is foluble in 

 acids, with which it forms falts, which have little or no tafte. 

 It is foluble in acids with equal facility a^fter having been ig- 

 nited, as when frefii prepared. It fufes with borax into a 

 tranfparent Colourlefs glafs. 



100 parts of the Saxon beril yielded Profeflbr Tromfdorf 

 "78,0 Aguftine, 4,5 alumine, and 16,0 filex. 

 I am. Sir, 



Your iHoft obedient, 



FREDERICK ACCUM. 

 ] 1 , Old Compton Street, Sobo, 

 ]5th Oaober, 1803. 



XI. 



Letter from a Correfpondent concerning the Method propofed b^ 

 Mr. Carlijlefor clojing iiide-mouthed Vejfels. 



Odober 15, 1803. 

 SIR, 



JLN the laft number of your Journal, publifhed on the firft of The method ^ 

 this month, page 68, I find a letter addreffed to you by Mr. J^'^'^Xd'S^ou 

 Carlifle, defcribing *' a method of clofing wide mouthed vef- laft number 

 fels intended to be kept from communicating with, the air ;" 

 and in Plate V. Fig. 2, there is an engraving of the veflel re- ' 



* It is perhaps needlefs to ftate that the alumine may be feparated 

 from the alcaline folution, by faturating it with muriatic acid in ex- 

 cels, fo as to neutralize not only all the potafh, but alfo to diflblve 

 the alumine, and then to deconipofe the obtanied folution by car- 

 bonate of ammonia. Should glucine be expe6led, the carbonate of 

 ammonia fhould be added in confiderable excefs ; for the excefs of 

 ammonia retains in folution the glucine, and nothing but alumine 

 will be thrown down. The glucine may be obtained by evapo- 

 rating the folution to drynefs and igniting the refidue. 



F. A. 



