Part III. Of Tin, Lead, and Iron. 329 
with feme fparks of Metal. It feems near as heavy as the 
pure Tin it felt 
CHIMNEY-TIN, forced up from the Herd. 'Tis black 
fhining and heavy 5 alrnoLt like very fine black fand. 
A Metalline Slat from the Tin-Mines. 
See a large Account of the Tin-Mines of Cornwall and 
Devonjhire, in the PhiL Tran\ anions 3 (a) communicated 00 Num.*? 
by a Perfon much converfant among them. As alfo ano- 
ther accurate one particularly of thofe in Cornwall ; com- 
municated by Dr. Chriftepher Menet, and by Me publifhed 
in the faid TranJ anions, (b) (b) Num. 
Tin is mixed with Copper, in the making of Metal for 
Bells, Organ-Pipes, &c. the proportion of Tin to Copper, as 
twotofeven, or thereabout. If under, it will be too foft $ 
if over, too brittle. The Metal ufed for Concaves and Spe- 
culums, is likewife a Mixture of Tin and Copper. Of Tin, 
with Lead, and the Marchafite of Antimony of each * th part, 
is made one fort of Printing Letters. Of this Metal is 
made that fort of Cerufs, called Spanijh White 3 one of the 
beftufed either by Painter s,or by Women. Stannum ufium, 
the bell: prefervative of the polifh of Metallic!^ Concaves, and 
the like. Paver im (c) highly commends his Bezoardicmn C<0 obferv. 
Jovis againfi: Malignant Fe avers. A Mixture againft theobf/56. 
Bitings of Mad Dogs, confiding chiefly of Mithridate and 
the Filings of Tin, is much ufed and relied upon by fome 
Huntfmen. 
CRYSTALLINE LEAD, from the Mine. So I call it, 
not that it is clear, but confifteth for the moil part of Hexa- 
gonal Points. Of the bignefs of a midling Apple. 
LEAD ORE, rich in SILVER. Given by Sir R. Moray, 
'Tis of the ufual colour, but mixed with white Spar, fo hard 
as to cut Glafs. And I fuppofe, that moft Lead Ores with 
fuch a Spar, have Silver in them. 
LEAD ORE holding SILVER, and growing together 
with Iron Ore. 
LEAD ORE, probably alfo holding Silver. It lies in a 
whitifh Spar, which is not fo flaky as is ufual, and will cut 
Glafs. 
LEAD ORE holding SILVER, with a large CryjiaUine 
Spar confifting chiefly of Hexagonal Points , and of the 
U u colour 
