MINERALOGY, ? 53 



in the fame manner as theNaphta, from 

 fome wells in Italy, and in a deferted 

 mine at Ofmundfberget in the province 

 of Dalarne : at this 1 aft-mentioned place 

 it is found in fmall hollows in the lime* 

 ftone, as refm is in the wood of the pines. 



SECT. CXLIX. 



B. Thick and pitchy Rock-oil, or Barbadoes 

 Tar, Petroleum tenax, Maltha. 

 This refembles foft pitch. 

 It is found in MofTgrufvan, at Nor- 

 berg, in the province of Weftmanland, and 

 at the Dead Sea in the Holy Land, 



SECT. CL. 



C Hardened Rock-oil, Petroleum induratum. 

 Foflil Pitch, Pix montana. 

 i. Pure, Afphaltum. 



This leaves no afh or earthy fubftance 

 v/hen it is burnt. 



It is found at Finnberget, in the pa- 

 rifh of Grythytta, in Weftmanland. 



From this or the preceding fubftance, 

 it is probable, the afphaltum was pre- 

 pared that the Egyptians ufed in em- 

 balming their dead bodies, ancl v/hich is 

 now called Mummia. 

 2. Impure, Pix montana impura. 



This contains a great quantity of 

 earthy matter, which is left in the retort 

 after diftillation, or upon the piece of 

 charcoal, if burnt in an open fire; it 

 coheres like a flag-, and is of the colour 

 of black lead : but in a calcining heat 



this 



