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XIII. On Boswellia and certgín Indian Terebinthaceæ. By Henry 
"Thomas Colebrooke, Esq. F.R.S. and L.S. 
Read April 4 and 18, 1826. 
A pescrterion of the tree which yields the Indian olibanum, 
(a gum-resin apparently undistinguishable from Arabian frank- 
incense, though possibly the production of a different plant,) - 
was inserted in the Asiatic Researches* under the name of Bos- 
wellia serrata: and another species of the same genus, Boswellia 
glabra, which likewise affords a resin burnt as incense in Hindu 
temples, and employed with vegetable oil for the more useful 
purpose of marine pitch, has been described by Roxburgh in 
his third volume of Indian Plantst. In neither instance was 
the conformation of the seed particularly noticed. "To supply 
that omission and furnish the carpology of this interesting genus, 
a full description of the fruit of the first-mentioned species is 
here subjoined. It is chiefly derived from the same source ; 
that is, from my lamented friend Dr. Roxburgh's observations 
in aid of my own. 
As the dissection of the germ shows the natural number of 
each cell to be two, that part of the generic character, as ori- 
ginally given, which specifies solitary seeds, may be modified ; 
since they are single only by abortion. For this result is not to 
be invariably expected in all situations ; though more than one 
* Vol. ix. p. 377. + Part I. t. 207. 
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