BURSERACEZ.. 815 
of this gum is ¢'=* Dijaj or Dajj4j, and it is described under 
that name in the Makhzan-el-Adwiya as a gum like olibanum 
brought from the mountains of Oman, which is better than 
soap for washing clothes, as it makes them whiter; it is also 
Said. to be a useful application to wounds to remove proud 
flesh and promote healing; when made into a paste with 
honey it is applied to chronic rheumatic swellings of the 
limbs. (Op. cit., article Dajjaj.) Vaughan sent a sample of 
Hotai from Aden to Hanbury, who gives the following 
description of it :— 
“Trregular pieces 14—1 dale their longest diameter, 
frequently rounded on one side, as if portions of large tears, of 
entire smaller tears, and of irregular little fragments produced 
by the fracture of the masses. It is of wax-like opacity, 
cracked in all directions, and readily breaking up into angular, 
. pieces; on the exterior the larger pieces are yellowish-brown 
or somawhat liver-coloured, and occasionally encrusted on one 
side with a reddish sand, upon which they appear to have 
fallen when in a soft state ; internally the colours are generally 
paler or nearly white, sometimes darker towards the centre of 
the tear. The gum is nearly inodorous, but in taste is slightly 
bitter and acrid to the throat. A few fragments agitated with 
water in a phial speédily afford an emulsion, which remains 
frothy and milky for many days.” is 
Bentley and Trimen have ‘iient that Hotai may be the 
Same as Opaque Bdellidm, but Parker (Pharm. Jour., July 
17th, 1880 ») has pointed out that tincture of the latter gum- 
resin gives an: intense greenish-black colour with tincture of 
~ Perchloride of i iron, whereas gum Hotai gives no such reaction, 
BALSAMODENDRON OPOBALSA- — | 
MUM, Kunth. cae 
ae &§ Trim., t. 59. Balsam tree Bag Ms Balsamier 
dela Mecque (Fr.). 
- Hab.—Arabia. The balsam, wood, aa 
gt 
