C 4 ° ^ 
New- Tor k and Britain , which on the Northern Part 
may be made fo wide as to take in the Newfoundland 
Trade, &c. But l (hall mention no more Particulars j 
for in the fame Manner it will be eafy to confftud Ta- 
bles to all thofe confiderable Parts of the World, to 
which Voyages are perform’d. 
V. Some ObferVations towards compojing a Natural 
Hiftory of Mines and Metals, conwiunicated in 
a Letter to Dr. Rutty, S. R. Seer. Coll. 
Med. Lond. Soc. By Vr. Frank Nicholls, 
Profeffor of Anatomy at Oxford. 
Dear Sir 3 
I N Obedience to your Commands, I here fend you the 
Particulars of what I obferv’d during a Year’s Stay 
in the Weftern Part of Cornwall , concerning Mines , 
die. 
Mines in general are Veins or Cavities within the 
Earth, whole Sides receding from, or approaching 
nearer to each other, make them of unequal Breadths 
in different Places ^ fometimes forming large Spaces, 
which are call’d Holes. They are fill’d with Sub- 
ffances, which, whether metallic!*, or of any other Na- 
ture, are term’d the Loads. When the Subftances form- 
ing thefe Loads are reducible to Metal, the Loads are 
by the Miners faid to be alive ; otherwife they are 
term’d dead Loads . 
In 
