ADVERTISEMENT 
TO THE 
THIRD EDITION. 
Since this work ivas first printed, the author has 
made in it considerable improvements. The first 
volume, particularly, contains many additional ar- 
ticles, and more titan half of it has been re-written. 
The plates also have been re-engraved. For the plate 
of the mountains a new drawing has been made, 
that the scale might be extended, and many particu- 
lars might be introduced which before were omitted. 
For the plates of vegetables every drawing has been 
corrected; and, in place of such figures as were most 
defective, new ones have been inserted. 
Charlotte-street, Bloomsbury, 
London, 1st March, 1821. 
