( m ) 



herbs which every where cover the fur- 

 face of the earth, and which probably 

 poffefs many valuable properties, which, 

 however, are at prefent unknown ; and. 

 as a defcription of thefe exotic produc- 

 tions, without the knowledge of their 

 qualities, would contribute but little 

 either to utility or entertainment, I 

 £hall leave them in obfcurity, and fi- 

 nifh my Effay on the Vegetable Syftem 

 of this country, with an obfervation 

 from Pliny, which is very applicable to 

 the Natural Hiftory of Guiana : 



" Multum adhuc reftat operis, mul- 

 f< tumque reftabit, nec ulli nato poft 

 u mille fecula prascluditur occafio ali- 

 " quid adjiciendi." 



The great length to which this Let- 

 ter has already extended, obliges me 

 to defer the fubjedt of my private con- 

 cerns to a future occafion. Happily, 



I indeed, 



