The tree caà verà, which produces the dragon's-blood, is middle-sized
both as to height and bulk. Some botanists call these trees _palmæ
pruniferæ foliis jaccæ_, but in my opinion they have no affinity
whatever with palms. When a deep incision is made into their trunks, a
kind of juice flows from them, resembling blood in colour and
consistence, and which, when boiled on the fire, condenses into a
liver-coloured rosin. Physicians complain that foreign traders sell them
goat's-blood, bolo, or red Brazil wood, mixed with gum arabic, for
dragon's-blood.