For several years past the rapid development of Alaska and the establishment of growing American interests in regions theretofore unsurveyed and imperfectly known brought into prominence the urgent necessity of a practical demarcation of the boundaries between the jurisdictions of the United States and Great Britain. Although the treaty of 1825 between Great Britain and Russia, the provisions of which were copied in the treaty of 1867, whereby Russia conveyed Alaska to the United States, was positive as to the control, first by Russia and later by the United States, of a strip of territory along the continental mainland from the western shore of Portland Canal to Mount St. Elias, following and surrounding the indentations of the coast and including the islands to the westward, its description of the landward margin of the strip was indefinite, resting on the supposed existence of a continuous ridge or range of mountains skirting the coast, as figured in the charts of the early navigators. It had at no time been possible for either party in interest to lay down, under the authority of the treaty, a line so obviously exact according to its provisions as to command the assent of the other. For nearly three-fourths of a century the absence of tangible local interests demanding the exercise of positive jurisdiction on either side of the border left the question dormant. In 1878, questions of revenue administration on the Stikine River led to the establishment of a provisional demarcation, crossing the channel between two high peaks on either side about twenty-four miles above the river mouth. In 1899, similar questions growing out of the extraordinary development of mining interests in the region about the head of Lynn Canal brought about a temporary _modus vivendi_, by which a convenient separation was made at the watershed divides of the White and Chilkoot passes and to the north of Klukwan, on the Klehini River. These partial and tentative adjustments could not, in the very nature of things, be satisfactory or lasting. A permanent disposition of the matter became imperative.