( 31 ) 
2 . Sp^T, This is conipoled of CfyJiaT inixt with 
other Bodies. Thofe which they call Sugar-fparsy 
are thofe whofe Cryftallifations are veryfinalJ, and fb 
on crumbling to Pieces have the Appearance of pow- 
dered Sugar. 1 have two Sorts of thefe: white and 
blue. Dogtooth Spar is a white pointed Spar, in 
rorm and Colour fomething refembling Teeth. 
Cauk, This Dr. *’ fays is a coarfe 
talky Spar. But in that Subftance which I* met with 
in this Country under the Name o^Cduk-. I could not 
dilcover any Flexibility or Elaflicity, which that 
learned Writer has fet down as Charadlerifticks o^Talk' 
and Talky Eodtes. f It feems to me to be nothing 
but Spar ^ incorporated with a coarfe earthy Matter; 
When this Cduk is mixt with pellucid' Cryftallifatil- 
ons of Spar^ it is called Baftard Cauk. 
There are feveral other Bodies mixt in the Mines 
with Lead'Ore ^ But as they did not occur in thole 
Mines which I examined, I fhall omk the Mention 
of them. 
When the Ore is brought up from the Mine it is 
broken to Pieces that the Spar, Cauk^ or other Bodies 
wluch adher’d to it may be the more ealily feparated; 
It is then 'thrown ihto a large Sieve and walhed, and fa 
farther purified from extraneous Bodies. After this, , 
it is carried to the Furnace in order to be fmelted. The 
Furnace, which I faw near was very rude 
and fimple, confiding only of fome large rough Stones 
placed in fuch a Manner as to form a fquare Cavity^! 
into which the Ore and Coals are thrown Jlratum fu-- 
perfratim ; two great Bellows continually blowing, 
the Fire, being -moved alternately by Water, I faw/ 
^ Method of Foffilj, p. I?, t Catalogue of Foflilj, Yol, i. part i. p. 57^ 
nov 
