KOONA, a species of Bonites (for which see Encyc.), very common in the woods of North Africa. It is a shrub, of which the leaves, when boiled with a small quantity of water, yield a thick black juice, into which the negroes dip a cotton thread. This thread they fasten round the iron of their arrows, in such a manner that it is almost impossible to extract the arrow when it has sunk beyond the barbs, without leaving the iron and the poisoned thread in the wound. The poison of the koon is said to be very deadly.—Park's Travels.