44 APPENDIX. 



would be fome objection to this fuppofition : Firft, on ac- 

 count of the flower, which is certainly rofaceous, compo- 

 fed of feveral petals, and is not campaniform : Secondly, 

 That it produces no fort of gum, either fpontaneoufly or 

 upon incifion, at no period of its growth ; therefore I ima- 

 gine that the gum which comes from Africa in fmall pie- 

 ces, firft white on its arrival, then turning yellow by age, 

 is not the produce of this tree, which, it may be depended 

 upon, produces no gum whatever. 



Juba the younger is faid, by Pliny, to have given this 

 name to the plant, calling it after his own phyfician, brother 

 to Mufa phyfician to Auguftus. We need not trouble our- 

 felves with what Juba fays of it, he is a worfe naturalift 

 and worfe hiftorian than the JNubian geographer. 



RACK. 



THIS is a large tree, and feems peculiar to warm climates. 

 It abounds in Arabia Felix, in Abyffinia, that is, in the 

 low part of it, and in r\ubia. The firft place I faw it in was 

 i in 



