INTRODUCTION, 
T HE County of Cornwall claims the 
peculiar attention of mineralogifts, 
on account of its fubterraneous natural 
productions. No country in the world 
can boaft of mines more ancient, of 
productive for a longer period. Fof 
before the time of Herodotus, the Phoe¬ 
nicians, and after them the Greeks, 
brought tin from this country, which, 
on that account, was named by the lat¬ 
ter nation Caffiterios, or the Tin-ifland : 
and with refpeCt to the - prefent richnefs 
of thefe mines, inflances will be given 
in the courfe of this work, of the pro¬ 
fit of Angle mines, which (hew, that it 
is not an exaggerated account which 
Mr. Jars gave in the year 1770, that 
the value of the annual produce of the 
tin-mines amounts from 190 to 200,000 
B - pounds, 
