INFLAMMABLFlS. 74. Bitiiiticn. 229 



faiustris* Of a dark co'our, confo'idatlng in the air, binning qnicker 



anti with Icfs offcnfive fumes. 



Humus vegetahil'j. '^yft. nat. xii. 3. /), 210. «. 6, 



Humus combu-llibiiis. Wall. f\Jl- \ p- 21. n. 7. 



Peat. Kir^van nitnernl. z. p 62. 



Found every where in bogs and morafles, and is generally the 

 middle and lower beds under turf, and frequenily at th-^ 

 bottom of bogs where the water has lutn ftagnant : the vege- 

 table fubftances are in quite a decayed flate, and therefore lefs 

 vifible: a brick of 14 inches long, 6 broad, and 4 thicl', vvill 

 weigh from a pound and a quarter to a pound and three 

 quarters : it is, in many peaces, a prircipd article of fuel, 

 and its afhes are('f confiderable value a> a manure. 



plcea. Of a dark colour, confolidating in the air, a little greafy 



to the touch, impregnated with a large proportion of 

 bitumen, and burning wiih much heat and fumes. 



Turfa folida, Cronft, win. 284. 2, i. l. 



Found on plains at the tops of higher mountains, frequently en 

 thofe compofed of granite, ar5d at the bottom of ii^gnanc wa- 

 ters : after being fometime kept it will burn like coal ; it is 

 the mod ponderous of its kind, a brick 14 inches long, 6 

 broad, and 4 thick, weighing about two pounds. 



74. BITUMEN. Eafily combuftible with flame, 

 and emiiting when ignited a Urong odour, grea- 

 fv to the touch. 



Naphthay Fluid, whitifli, volatile, highly inflammable. 



Bitumen fluidum. Sy}. vnf.xVi. 3./>. 'og. n. i« 



Bitumen fluidilTimum, Wall fyst. z. p. Sg.tr. i. 



Oleum montanum. Wclder/d. min. Z/\.. 



Naphtha. Kimvan mineral. 2. p. A^z. 



Naphtha, ^chmeifser miner. I. /. 285. 



Naphtha. 7homfon chem. 4, p. 8. 



Found principally in Ve>-fta and Media, where it oozes liler 

 water out of fand-ftone% is fluid and tranfparent, fwims on 

 alcohol and is infoluble in it, catches fire on the approach of 

 flame, burns with a white flame and leaves hardly any refi- 

 duum : it is io volatile, that in warm weather it fills the., 

 atmofphcre around it with its odour : has fomewhat of a fliarp. 

 taile, and is not mifcible with water: after expofure to the 

 air, it becomes yellow, and afterwards brown; its conuifcnce, 

 is increafcd, and at Ifeft it palfes into petroleum : fpecifi<; 

 gravity when white 729, when yellow 847* 



