I 
a 
Vi ADVERTISEMENT. 
may be of fome amufement and ufe to 
the Englifh Naturalift, in giving him 
a more accurate defcription and analyiis 
of minerals of his own country, than 
has yet appeared in the Englifh lan- 
guage. He would hope too that it may 
render fome fervice to the fciences of 
, • i- 
Chemiftry and Mineralogy, the interefts 
of which cannot fail to be promoted, 
by diffufing the knowledge of every 
thing which refpedts them; it may, 
accidentally, perhaps, increafe the num¬ 
ber of thofe who ftudy thefe fciences, 
and excite a fpirit of greater diligence 
and precifion in refearches connected 
with them. 
The Tranflator is not certain, whe¬ 
ther it may not be proper for him to fay 
fomething by way of vindication of the 
Author, and fomething by way of apo- 
logy 
