?£1 A SYSTEM OF 



B. Tranfparent, Succinum diaphanum. 



a. Colouriefs. 



b. Yellow. 



The greatcft quantity of European 

 amber is found in Pruffia -, but it is, be- 

 fides, collected on the fea-coafl of the 

 province of Skone, and at Biorko, in 

 the Lake Malaren, in the province of 

 Upland ; as aifo in France and in Si- 

 beria. It is chiefly employed in medi- 

 cines, and for making varnifkes. 



SECT. CXLVII. 



3. Rock-oil, Petroleum. 



It is an inflammable mineral, of a light- 

 brown colour, which cannot be decompound- 

 ed, but is often rendered impure by hetero- 

 geneous admixtures. In length of time, it 

 hardens in the open air, like a vegetable 

 refm, and then becomes of a black colour, 

 whether it is pure, or mixed with other bo- 

 dies. It is likewife found in the earth 

 A. Liquid, 



1. Naphla, Naphta. 



This is faid to be of a very fragrant 

 fmell, tranfparent, extremely inflamma- 

 ble, and attracts gold. It is gathered 

 from the furface of the water in fome 

 wells in Perfia. 



SECT. CXLVIII. 



|. Rock-oil, Petroleum, proprie fie diftum. 

 This fmells like the oil of amber, 

 though more agreeable, and is likewife 

 very ready to take fire. It is collected 



