[ m 1 



which it is faid the Chinefe make rings for lafcivious 

 purpofes^ but here ufed by furgeons for injecting 

 liquids, and by painters for rubbing out black- 

 lead-pencil marks. Is this gum manufactured in 

 India or China, and from what plant, and in what 

 manner, with the different ufes it may be applied 

 to ?. Is the plant an Euphorbia or Apocynum ? 



19. What plants produce gum myrrh and gum 

 ammoniac, and how are they collected ? 



20. What plant affords the gum mi rubrum af- 

 tringens from Gambia ? 



SECT, 



