But a business carried on with such relentless vigor naturally soon taxed the resources of nature beyond its capacity for reproduction. In regions under the control of a single organization, as in the vast domains of the Hudson's Bay Company, great care was taken to preserve the fur-bearing animals from extinction; but in United States territory, the exigencies of competition made any such provision impossible. The poor beaver, as at a later day the buffalo, quickly succumbed to his ubiquitous enemies. There was no spot remote enough for him to build his dam in peace, and the once innumerable multitude speedily dwindled away. The few years immediately preceding and following 1830 were the halcyon days of the fur trade in the United States. Thenceforward it rapidly declined, and by 1850 had shrunk to a mere shadow of its former greatness. With its disappearance the early knowledge of the Upper Yellowstone also disappeared. Subsequent events--the Mormon emigration, the war with Mexico, and the discovery of gold--drew attention, both private and official, in other directions; and the great wonderland became again almost as much unknown as in the days of Lewis and Clark.
On the west bank of the Yellowstone River, a quarter of a mile above the Upper Falls, in a ravine now crossed by a lofty wooden bridge, stands a pine tree, on which is the oldest record, except that of Colter, of the presence of white men within the present limits of the Park. It is an inscription, giving the initials of a name and the date when inscribed. It was discovered in 1880 by Col. P. W. Norris, then Superintendent of the Park. It is now practically illegible from overgrowth, although some of the characters can still be made out. Col. Norris, who saw it fifteen years ago, claims to have successfully deciphered it. He verified the date by counting the annual rings on another tree near by, which bore hatchet marks, presumably of the same date. The time that had elapsed since these cuts were made corresponded well with the inscribed date. The inscription was:
Efforts have been made to trace this inscription to some of the early noted trappers, but the attempt can hardly succeed. Even if an identity of initials were established, the identity of individuals would still remain in doubt. Nothing short of some authentic record of such a visit as must have taken place can satisfy the requirements of the case. In the absence of any such record, the most that can be said is that the inscription is proof positive that the Park country was visited by white men, after Colter's time, fully fifty years before its final discovery.