59^ On the Aerated Barytes, 



Some Accov a T of a Mine in which the Aerated 

 Barytes is found-, hy Mr. James Watt,_;«». 



READ NOVEMBER 30, I789 



THE late fuccefsful and important applica- 

 tion of the Muriated Barytes, in fcrophy- 

 lous cafes, by Dr. Crawford, having much 

 increafed the demand for that Salt, it is become 

 of confequence to humanity that the means of 

 procuring its bafis, the Ponderous or Barytical 

 Earth, Ihould be facilitated, and its fcarcity dimi- 

 niftied. The method commonly employed, of 

 obtaining it from the Vitriolated Barytes, by 

 treating this latter with mild alkali, or charcoal, 

 is troublefome and expenfive, whereas the Aera- 

 ted Barytes prefents us with it naturally in fuch 

 a ftate, that it may immediately be ufed for folu- 

 tions in acids, without any previous preparation 

 whatever ; it is therefore much to be defired 

 that the fources from whence a plentiful fupply 

 of this lately difcovered FoITil may be obtained, 

 fhould be made known to the public, from 

 whom its native places have hitherto been kept 

 a fecret, and fpecimens of it been fold rather 



for 



