Part III. Of Tin, Lead, and Iron. 329 
with fomc fparks of .Metal. It fcems near as heavy as the 
pure Tin it felf. 
CHIMNEY-TIN, forced up from the Herd. Tis black 
fhming and heavy 3 almoft like very fine black fand. 
A Metalline Slat from the Tin-Mines. 
See a large Account of the Tin-Mines of Cornwall and 
Devonfhire, in the Phil Tranfaciiotls ; ( a ) communicated 00 Num.^ 
by a Perfon much converfant among them. As alfo ano¬ 
ther accurate one particularly of thofe in Cornwall 5 com¬ 
municated by Dr. Chriftepher Menet, and by Ale publifhed 
in the faid TranfaLUons. (b) (i)Num. 
Tin is mixed with Copper, in the making of Metal for 
Bells, Organ-Pipes, istc. the proportion qf Tin to Copper , as 
two to (even, or thereabout. If under, it will be too foft • 
if ovei, 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 P h part, 
is made one fort of Printing Letters. Of this Metal is 
made that fort of Cerufs, called Spanish White 3 one of the 
beftufed either by Painters, or by Women. Stannum uftum, 
T £ n ^ P re ^ ervatl ve of the polifh of Metallic 4 Concaves, and 
die like. River ins If) highly commends his Begoardicnm 0 ) obferv. 
Jovis againfl Malignant Leavers. A Mixture againfl the obf 't 
Sitings of Mad Dogs, confiding chiefly of Mithridate and ' 5 ' 
the Pilings 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 confifleth for the mod part of Hexa¬ 
gonal Points. Of the bignefs of a midling Apple. 
, ORE, rich in SILVER. Given by Sir R. Moray, 
I is or the ufual colour, but mixed with white Spar, fo hard 
as to cut Glafs. And I fuppofe, that mod Lead Ores with 
luch 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 CryftaUine 
pm confiding chiefly of Hexagonal Points , and of the 
U u colour 
