VATES.
Poets are never in the wrong,
Whate'er the present age may say:
The future only, in their song,
Will see the truth of this our day;
And what a Bryant says and sings
May well outweigh all false-born things.
THE PHYSICAL SURVEY OF NEW YORK HARBOR AND ITS APPROACHES.
No coast offers more admirable opportunities for the study, on a large scale, of the effects of winds, waves, and currents, tidal and others, on the movable matters which line the ocean shores, than that from New York southward. Besides the peculiar local actions, there are general ones, which are changing, slowly or rapidly, the whole of the sandy coast line. While here the pebbles of the ancient drift are being assorted by size and shape, and rolled into ridges and heaps, by the action of the waves, there heaps and ridges of wet sand are formed by the waves and travel under their motion, and the dry sand is forced along by the winds, covering up meadows and woods, and changing the ocean shore line; and in other or the same localities, sub-currents, setting in a nearly constant general direction, roll onward the movable materials of the bottom of the sea, or tidal currents roll them forward and backward, giving the general direction of the resulting motion.
The reports of the Government and State engineers and commissioners, public and private, who have studied the improvements of different localities, have given us glimpses of the local, and even of the general actions; but most commonly there has been a want of means or such preliminary experiments as were necessary fully to develop the actions, and which, like the stitch which saves nine, would often have saved the costly experiment on the full scale of construction. Remarkable instances of complete modes of investigation occur in the examination of the Mississippi River by Captain A.A. Humphreys and Lieutenant Abbot, of the Topographical Engineers, and by the commission of which General Totten, Prof. Bache, and Admiral Davis were members. As most familiar to me, from having taken an official part in the experiments and observations made, I propose to notice the Physical Surveys of New York and Boston, indicating the chief agents which are at work in destroying and building up, so as to produce the present condition of these important ports.
In connection with the surveys made a few years since by direction of the Commissioners on Harbor Encroachments, there was undertaken, as an incidental inquiry, an investigation into the physical conditions under which the shoals and beaches in and about New York harbor had submitted to those changes of position and area which the repeated surveys revealed. It was at the request of these Commissioners that Professor Bache, the Superintendent of the Coast Survey, gave his personal attention to this subject. He drew up a comprehensive scheme for a series of observations upon all the natural agencies at work, and, for the execution of the project, selected one of his assistants, whose experience had already been considerable in similar studies.
The investigation was commenced in the lower harbor early in the spring of 1856. Records were kept of tides, currents, winds, and waves, and the most careful notes were made on the immediate effects of these working agents as observable in the movements of the sands.