*4 8 



HIS TORT of the SOCIETT. 



Dr Hope likewife read fome obfervations on the native car- 

 bonate of barytes or aerated terra ponderofa of Dr Wither- 

 ing. The two following defer ve moft to be noticed. 



After quoting the words of Doctors Withering and 

 Priestley, M. Sage, Fourcroy, Pelletier, and of Mr 

 Wedgewood junior, to fhow, that they all agree in aflerting, 

 that the fixed air cannot be expelled by heat from this fubftance, 

 he mentioned feveral experiments, in which heat alone deprived 

 it of its carbonic acid, rendered the earth cauitic, and caufed a 

 lofs of weight equal to 23 per cent* He defcribed the qualities 

 of the calcined barytic fpar. 



The fecond obfervation of importance relates to the cryftal- 

 lization of the pure barytes, which fubftance he has obtained 

 in beautiful and regular cryftals ; the more obvious, as well as 

 chemical properties of which he at full length recounted. 



TABLES fhewing the attraction of and for Strontites. 

 TAB. I. TAB. II. 



Strontites. 



Sulphuric Acid. 



Oxalic. 



Tartarous. 



Fluoric. 



Nitric. 



Sulphuric Acid. 



Barjtes 



Barjtes ~} 



Lime 



Lime 



Barytes 



Oxalic 



Strontites 



Lime £ 



Barytes 



Barytes 



Potafs 



Tartarous 



Potafs 



Strontites-^ 



Strontites 



Strontites 



Soda 



Fluoric 



Soda 



Potafs 



Potafs 



Potafs 



Strontites 



Nitric 



Lime 



Soda 



Soda 



Soda 



Lime 



Muriatic 









_ 





Succinic 



Muriatic* 



Arfenic. 



Phofphoric. 



Boracic. 



Carhonic. 



Phofphoric 



Acetous 



Arfenic 



Barytes 



Lime 



Lime 



Lime 1 



Lime 



Potafs 



Barytes 



Barytes 



Barytes > 



Barytes 



Boracic 

 Carbonic 



Soda 



Strontites 



Strontites 



Strontites j 



Strontites 



Stiontites 



Potafs 



Potafs 



Potafs 



Potafs 



Lime 



Soda 



Soda 



Soda 



Soda 



! 



The Brackets in Tab. II. denote, that it has not been difcovered how Strontites ftands 

 with regard to Barytes and Lime, in its attraction for the acid below which this mark 

 is made. 



END OF THE HIS TORT. 



