2 1 2 Elements of Mineralogy. 



of the denfity of nut oil. It is infoluble in 

 fpirit of wine. 



SPECIES V. 



Barladoes tar, Erdepech, Bergtheer, Kedria* 

 terrejiris, Maltha. 



Petrol long expofed to the air, forms this 

 fubftance. It is of a vifcid confiftence, 

 of a brown, black, or reddifh black co- 

 lour, fometimes inodorous, but generally 

 of a more or lefs difagreeable fmell, par- 

 ticularly when burned. It eafily melts, 

 and burns with much fmoke and foot, and 

 leaves either afhes or a flag, proceeding 

 from heterogeneities contained in it. Spirit of 

 wine cannot diflblve it. It contains a portion 

 . of the fuccinous acid, for with mineral al- 

 kali it gives a bitter fait, more difficultly fo- 

 luble than common fait, and which treated 

 with charcoal, will not afford fulphur. Mem. 

 erlin, 1758. 



It is found in Perfia, in the neighbourhood 

 of Petrol^ in ftrata of gypfum and lime- 

 ftone, or floating on water, alfo in Siberia, 

 Germany, Switzerland, and in coal-pits, alfo in 

 America* 



SPECIES 



