Earytlcal Genus. 57 



centrated acid, and 3 of water. 100 parts 

 of artificial barofelenite contain about 33 of 

 vitriolic acid and water, and 67 of Earth. 



Some fpecies, particularly the red, con- 

 tain i or two gr. of iron per cent. 



SPECIES III. 



Combined with the Sparry Acid. 



This combination has not yet been found 

 in nature ; that formed by art is nearly info* 

 luble in water. 



SPECIES IV. 

 Combined 'with the Tungften Acid. 



This combination is alfo infoluble in water, 

 but it has not as yet been found. 



SPECIES V. 



Mild Barytes intimately mixed 'with a notable 

 Proportion of Silex and Iron. 



I mention this fpecies on the authority of 

 Mr. fi'mdheim. 4 Berlin Schrift. 397. It is 

 infoluble in. acids, and of a fparry texture; 

 but, as he fays it becomes foluble after cal- 

 cination with oil, I mould be inclined to judge 

 it rather a barofelenite, 



SPECIES VI. 



