...hief of his corps, Colonel Abert, to help acquire, not to benefit by, the experience which now, by this date, has, under the auspices of the Light-House Board, perfected the light-house system of the United States . He came admirably equipped for the work, through his general training, through special training in such work in the office of Major Bache, through the special aptitude which he had for it, and thr...