INFLAMMABLES. 74. Bitumen. 



23 c 



AsphaU 

 thum* 



setum^ 



eiasticum. 



it does uot ftain the fingers, and on a hot iron flames with a 

 rather ftrong odour and leaves a quantity of afhcs : fpecific 

 gravity from 1,45. to 2,07. The Perlians value it highly, 

 and after mixing it with about a tiiird part of wax apply ic to 

 frefh wounids* 



Opakcj {hiningj black or brownifti-black, eafily melting 

 in heat, effervefcing with concentrated nitric acid« 



Bitumen friabile. Syst^ nat. xii. 3. /. i io. i^. 5, 



Bitumen folidum. Wall.fyfi. 2. /.93. «.4i 



Fix montana. Wolterfd. mm, ^5. 



Petroleum iuduratum. CronH. mw* 149. 3. t. 



Afphalt- Kirru. an mineral, z. ^.46. 



Bitumen. Schmei/Jer mineral, u^. 288. 



Afphalt. Thom/on cbem. 4. p, 10. 



Found abundantly in various parts of £'ttro/^, Ailut and Jmeriix^ 

 efpccially in the ifland Trinidad in a plain called Turlaney 

 where it covers the Airface of the earth for a confiderable 

 <liftance: its furface is hard, black, fhining, And refinous: 

 it eafily melts before the flame of a candle, and may be ufed 

 for the fame purpofcs as fealing-wax: when pure it burns 

 without leaving any aflies : when hardened is very brittle, 

 and was ufed by the ancient Egyptians for making mummies: 

 when difiblved in oil it is ufed as a varnifli for leather and 

 other purpofes: fpecific gravity 1*07. 



WhitCj rather brittle, floating on water> burning eafily 

 with a blue flame. 



Sevum mincrale. A£i, Stockh, art, 5. i. 2k 



Mineral tallow. Kirnvan rnineraU 2. p. 47. 



Found in the maritime parts of Finland in the neighbourhood of 

 Narkoy and at the lake Loja: it is fokble ih cold olive oil, 

 and in alcohol if mixed with a little alkali: is of the con- 

 fluence of tallow, lighter than ambergris, and burns quickly 

 leaving a confiderable refiduum of afhes, 



Brown^ folid, elaftic like indlan rubber. 



Mineral Cahoutchou. Kir-wan mimraL 2. p% 48. 



Elaftic bitumen. SchmeiJJer mineral, i, p, 290. 



Mineral Cahoutchouc, Thomfon chem. 4. p. 11. 



Found in the lead-mine of Odin, near CadUttnvn in Derhyjhire 

 with calcareous fpar : colour yellowifh or rcddifli-brown, 

 fometimes paler and refembling in colour and tcx*ure fine 

 cork : is very elaftic, and foft enough to be comprefled with 

 the fingers when freih, but hardens and gets rather brittle by 

 long expofure to the atmofphere : is infoluble in ether, alco- 

 hol, and oil of turpentine, bat is readily difiblved in oil of 

 olives : burns with a bright flame, and when diftilled yield's 

 bituminous oil infoluble in water, leaving a carbonaceous 

 refiduum: fpecific gravity 0,9053, :o 1,0833. 



