Mr. Hatcnerr’s Odfervations on Bituminous Subflances. 147 
ore of this mine (which is fuppofed to be one of the moft ancient 
in England) is galena, accompanied by fluor, calcareous and heavy 
fpars, quartz, blende, calamine, felenite, afphaltum, and the elaftic 
bitumen, although the latter is now rarely found*. Another 
{pecies of the elaftic bitumen has within about three years been 
found in a neighbouring rivulet; but I fhall not at prefent notice it, 
as I intend firft to defcribe the varieties of that which was firft 
difcovered, and which refembles the cahout-chou. In order to do 
this with more: perfpicuity, I {hall defcribe the {pecimens belonging 
to my colleétion, according to the mode in which I have arranged 
them. 
SPECIES tHe FIRST. 
nee pitt NOR 
Exastic bitumen of a yellowifh brown colour, part of which is 
almoft liquid like petroleum, and adheres to the fingers; the other 
part is of a darker colour, of a mammillary form, does not adhere to 
the fingers, and is foft and elaftic. This is on a grey bituminous 
limeftone, with white calcareous {par in the figure of hexaedral 
pyramids, forming that which is called the dog-tooth fpar. 
darld it thehaeer Ave. A, No. 2. pr 
Bitumen of a yellowith brown, partly liquid, and partly elafticy 
which, however, adheres to the fingers; on pale grey limeftone, 
with cryftals of white fluor fpar, blende, and galena. —On another 
part of the limeffone are fome’ globules of bitumen of "4 reddith 
brown, perfectly hard and brittle. _ 
AN 
‘ #1] am indebted to the!ingenious Mr. White Watfon, of Bakewell, for much  irfor- 
mation refpedting the local circumftances which attend this bitumen. 
Ye U2 A, No. 3. 
