"They cannot tell," was the reply, "until the trunk is split open, although a tribe of men in Sumatra say that they know before-hand, by a kind of magic, which is the right tree to cut down. But the beautiful, stately tree is often wasted in vain, and after all their hard work the camphor-seekers find the cavities of the split-up trunk filled with a thick black substance like pitch instead of the pure white camphor."