But even then the question of boundary was not finally settled by this great victory which had been won for the United States by the persistency of her statesmen. The treaty of 1846 continued the line of boundary westward along "the 49th parallel of north latitude to the middle of the channel which separates the continent from Vancouver Island, and thence southerly through the middle of the said channel and of Fuca's straits to the Pacific Ocean" Anyone reading this clause for the first time, without reference to the contentions that were raised afterwards, would certainly interpret it to mean the whole body of water that separates the continent from Vancouver,--such a channel, in fact, as divides England from France; but it appears there are a number of small channels separating the islands which lie in the great channel in question, and the clever diplomatists at Washington immediately claimed the Canal de Haro, the widest and deepest, as the canal of the treaty. Instead of at once taking the ground that the whole body of water was really in question, the English government claimed another channel, Rosario Strait, inferior in some respects, but the one most generally, and indeed only, used at the time by their vessels. The importance of this difference of opinion lay chiefly in the fact, that the Haro gave San Juan and other small islands, valuable for defensive purposes, to the United States, while the Rosario left them to England. Then, after much correspondence, the British government, as a compromise, offered the middle channel, or Douglas, which would still retain San Juan. If they had always adhered to the Douglas--which appears to answer the conditions of the treaty, since it lies practically in the middle of the great channel--their position would have been much stronger than it was when they came back to the Rosario. The British representatives at the Washington conference of 1871 suggested the reference of the question to arbitration, but the United States' commissioners, aware of their vantage ground, would consent to no other arrangement than to leave to the decision of the Emperor of Germany the question whether the Haro or the Rosario channel best accorded with the treaty; and the Emperor decided in favour of the United States. However, with the possession of Vancouver in its entirety, Canada can still be grateful; and San Juan is now only remembered as an episode of skilful American diplomacy. The same may be said of another acquisition of the republic--insignificant from the point of view of territorial area, but still illustrative of the methods which have won all the great districts we have named --Rouse's Point at the outlet of Lake Champlain, "of which an exact survey would have deprived" the United States, according to Mr. Schouler in his excellent history.