Human endeavor has supplied no nobler motive for public rejoicing than the union of the Atlantic and Pacific Oceans. The Panama Canal has stirred and enlarged the imaginations of men as no other task has done, however enormous the conception, however huge the work. The Canal is one of the few achievements which may properly be called epoch-making. Its building is of such signal and far reaching importance that it marks a point in history from which succeeding years and later progress will be counted. It is so variously significant that the future alone can determine the ways in which it will touch and modify the life of mankind. First of all, of course, its intent is commercial. Experts have already estimated its influence on the traffic routes. But these experts, who can, from known present conditions, work out the changes that will take place, that are already taking place, in the flow of commerce on the seven seas, cannot estimate the effect those changes will have on the life of the people who inhabit their shores. Changes in trade routes have overwhelmed empires and raised up new nations, have nourished civilizations and brought others to decay. From the days when merchants first followed the caravan routes, nothing has so modified the history of nations as the course of the roads by which commerce moved. Huge as was the Canal as a physical undertaking alone, it is not less stupendous in the vision of the effects which will flow from it. In this vision, the Western shore of the United States feels that it looms largely. No small part of the benefits of the Canal are expected to fall to the Pacific States. Long before it was completed, the minds of men in the West were filled with it. Its approaching completion appealed to everyone as an event of such tremendous significance as to deserve commemoration. Thus when R. B. Hale, in 1904, first proposed that the opening of the waterway should be marked by an international exposition in San Francisco, he merely gave expression to the thought of the whole West. The Canal is a national undertaking, built by the labor and money of an entire people. It is of international significance, too, for its benefits are world-wide. The Exposition thus represents not only the United States but also the world in its effort to honor this achievement. San Francisco and California have merely staged the spectacle, in which the world participates. An international exposition is a symbol of world progress. This one is so complete in its significance, so inclusive of all the best that man has done, that it is something more than a memorial of another event. It is itself epochal, as is the enterprise it commemorates. It bears a direct relation to the Canal. The motive of the Exposition was the grandeur of a great labor. Completed, it embodies that motive in the highest expression of art.