.SCIENTIFIC NEWS. 43^ 



ftttell refemWed ammonia; but owing to tli6 folullon being fo 

 extremely weak, was fcarce perceptihie ; but on a finger be- 

 ing dipped into it, and held near a ftopper, moiflened with 

 muriatic acid, evidently produced a white cloud, which di^l 

 appeared upon withdrawiug the acid, and re-appeared on its 

 approach ; which left alone I think may be fufficient to prove 

 ammonia to have been the bale. I may obferve, that the 

 falts were formed only on that part of the lable on which 

 fome muriatic acid had been fpilt; the neck of the nitrous 

 acid phial was covered with a mninure, which had a con- 

 fiderable ammoniacal fmell, and exhibited the fame appear, 

 ances with the moiftened ftopper, and was therefore uncom- 

 l>ined ammonia, and feems to Shew that the prefence of flie 

 muriatic acid was not neceflary for its formation. I have en* 

 deavoured to be as concife as podible, and remain 

 Your conftant reader, 

 jlpril 17, 1806. D. A. 



SCIENTIFIC NE1VS. 



Note on ike Porcelain of Beainnur Communicated bj/ Veau de 

 Launai* . 



Jyl. PECARD of Tours, manufafturer of Rouen flone ware, Reaumur'* 

 has repeateded in his furnace Reaumur's experiment of trans- PO''"Jfi" m^t 

 forming glals into porcelain ; mentioned in the memoir of the itate. 

 Academy of Sciences, for the year 1739, p. 370, M. Pecard 

 obtained adevitrification as complete wiihin as without. His ex- 

 periment \yas made upon a common glafs bottle from the Ancenia 

 Foundry. The bottle was filled with Ncvers land, and depo- 

 fjted in ajagger, which was afterwards filled up with the fame 

 fort of fajid. The fagger or cafe was placed with others, con- 

 taining earthenware in the chimney or upp>er part of the fur- 

 nace, and heated as ufual. When the operation was finilhed, 

 and the furnace was fufficiently cooled, the bottle was taken 

 from its bed of fand in the fagger, and emptied of its contents. 

 The bottle had undergone no alteration of ftiape; but its green 

 colour and tranfparency were exchanged for milky opacity, 

 equally fpread over all parts of the bottle. In this, his firft ex- 



* Journal de Phifique, Vol. LXI; p. 401. 



periment. 



