DESCRIPTION OP THE FRANKINCENSE-TREE. 189 
bonate of lime. The young trees produce the best and 
most valuable gum; the older merely yielding a clear glu- 
tinous fluid resembling copal varnish, and exhaling a strong 
resinous odor. 
During the south-west monsoon, the pastoral tribes in the 
neighborhood of Ras Feeluk collect large quantities of 
frankincense, which they barter to the Bonians, of whom 
a few reside at the villages along the Abyssinian coast. 
Boats from Maculla, and from other ports on the opposite 
Arabian shore, also come across during the fine season, 
and carry away the gums that have been accumulated, 
and which are exchanged for a coarse kind of cotton cloth 
worn by the Somauli. — Harris's Highlands of (Ethiopia, 
vol. i., p. 417. 2d edit. 1844. 
[There are two kinds of olibanum or frankincense de- 
scribed in pharmacological works, one called Indian oli- 
banum, which is obtained from the Boswellia surata, the 
other denominated African or Arabian olibanum. The 
latter is obviously the one referred to by Captain Kemp- 
thorne. As found in commerce, it is always intermixed 
with crystals of carbonate of lime. No botanical descrip- 
tion of the tree yielding it has yet been published. — Ed, 
Pharm. Jour. 
17* 
