[ 21 ] 
account of native lead may appear in the Philofo- 
phical Tranfadtions, as well as the firft account of 
native tin. 
N. B. In more than 300 afTays of lead ore, I 
have met with nothing of the kind before. 
I am, 
Yours. &c„ . 
M. Morris. 
IV. Farther 
