It is worth noting on how slender foundation generally accepted theories often stand, and it ought to be a lesson not to take all preaching for sound doctrine. We all know how universally accepted, a half century ago, the belief was that rapid-growing timber was good for nothing - only that which grew slow was worth touching. People saw that the Hickory and Oak grew slow, and that the Willow and Poplar, which grew fast, were only fit for the paper mill. But now we find that the Ailanthus, Catalpa, Osage Orange, Mulberry, and the faster-growing kinds of Oaks, the Blue Gum, and other fast-growing things, are among the best timber trees in the world.

It was the old notion that hard timber grew slow that created such a ghost in the public mind about the disasters to the nation to come from the disappearance of the forests. When timber gets scarce enough to make it profitable to raise more, the enterprising "Yank" will get up a new supply on short notice; and he will not want to send a commissioner to Europe to find out what trees grow fastest in the American climate, but will look to American facts for American people.