[ 93 ] 
of longer continuance. It would be extremely dif- 
ficult here, though the plants thrive very well, 
to produce from the white poppy, or Cifius ladani- 
fera, either the opium or the labdanum, the known 
production of thefe vegetables in other parts of the 
world. No art can make here the tragacantha pour 
forth its gum, the lentifcus its maftic, or the candle- 
berry myrtle of North America its febaceous con- 
crete. To thefe might be added many others, too 
tedious to mention. 
In fuch mild winters as the laft, the leaves of hem- 
lock may be procured in any part of them ; but they 
are not to be depended upon, as their fpecific fmell 
is then comparatively weak, their juices poor and 
watery, and they are wholly without fpots.. 
l am, , 
With all pofilble regard, , 
Gentlemen, 
, Your moll obedient 
humble fervant, 
W.Watfon. 
xvi; Jn. 
