■dsphaU 
thum. 
‘Usticum, 
INFLAMMABLES. 74. Bitumen. 231 
it does uot (lain the fingers, and on a hot iron flan-es with a 
rather ftrong odour and leaves a quantity of alhes: fpecific 
gravity from 1,45. to 2,07. The Periians value it highly, 
and after mixing it with about a third part of wax apply it to 
frefli wounds, 
Opake, (hilling, black or brownifli-black, eafily melting 
in beat, efFervefeing with concentrated nitric acid. 
Bitumen friabile. Syst, nat. xii. 3. p. 1 10. n, 5. 
Bitumen folidum. Woli./yfi. 2. /.93. « 4 - 
Pix montana. Wolterfd mtn. 25. 
Petroleum iuduratum. Crond.min. 149. 3. i. 
Afphalt. Kir^-an mineral. 2. p, 46. 
Bitumen. Schmft§m- mineral, 288. 
Afphalt. Thom/on cbem. p. \ 0 . > a ■ 
Found abundantly in various parts of Europe, Alta, and Amenca, 
efpecially in the ifland Trinidad in a plain called T*r 4 rBr, 
where it covers the furface of the earth far a conndcrnblc 
diftance: its furface is hard, black, (hining, and refinous: 
it eafily melts before the flame of a candle, and may be uled 
for the fame purpofes as fealing-wax: when pure it burns 
without leaving any afties : when hardened is very brutle, 
and was ufed by the ancient Egyptians for making mummies: 
when diflblved in oil it is ufed as a varnilh for leath.-r and 
other purpofes : fpecific gravity 1,07. 
White, rather brittle, floating on wtiter, burning eafily 
•with a blue flame. 
Sevum minerale. Adi. Stockh, art.^. 1. 2. 
Mineral tallow. Kiro.van mineral, z- p- M • 
Found in the maritime parts of Finland in the neighbourhood ot 
Narko, and at the lake Loja: it is foluble in cold olive oil, 
and in alcohol if mixed with a little alkali; is of the con - 
fiftence of tallow, lighter than ambergris, and burns quickly 
kaviiig a confiderable reflduum of alhes. 
Brown, folid, elaftic like Indian rubber. 
Mineral Cahoutchou. Kimwan mineral. 2. p. 48. 
Elaftie bitumen. Schmei/er mineral. 1. p. 290. 
Mineral Cahoutchouc, Thomfon chem. 4. it. 
Found in the lead-mine of Odin, near Caliletonvn in Derbyjhire 
with calcareous fpar : colour yellowilh or rcddifli-brown, 
fometimes paler and relembling in colour and tofue fine 
cork : is very elaftie, and foft enough to be comprefled with 
the fingers when frefh, but hardens and gets rather brittle by 
long expofure to the atmofphcre; is infolublc in ether, alco- 
hoi; and oil of turpentine, but is readily diffjlved in oil of 
olives : burns with a bright flame, and when dilblled yields 
bituminous oil infoluble in water, l-aving a carbonaceous 
refidu,pm; fpecific gravity 0,9053, to 1,0233. 
