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To-day Colonel GREGORY, of the Ninety-first Pennsylvania Regiment, is breaking up his quarters with a view to immediate field service. The relations the Colonel has sustained to this community, have been of the most intimate character. Since the 25th of April last he has been Provost Marshal, and has discharged his duties, in connection with his office, in such a manner as to warrant the warmest praise from every citizen of Alexandria. On his arrival here he found the city filled with the most bitter Secessionists, who were disposed to do everything that lay in their power to oppose his plans.
Regardless of all the difficiulties that stood in the way of a peaceful administration, he has steadily progressed with his labors, until now the city presents the appearance, as far as its inhabitants are concerned, of a quiet New England village. Its sanitary relations are far better attended to now than ever before, and life and property receive their full protection. I speak thus extendedly of Col. GREGORY, as his course here reflects honor on Philadelphia, whence he and his regiment came. After the departure of Col. GREGORY, the duties of the office of Provost Marshal will devolve upon COl. WILLIAMS, of the Sixty-third Indiana, a gentleman who enjoys the fullest confidence of his soldiers and the highest respect of all who know him.
There are many things about Alexandria worthy of notice. The contrabands at work on the streets, in the hospitals, in the public laundries, number about one hundred and fifty. They are paid forty cents a day, and are allowed the regular rations of the soldiers. They seem to be a contented, happy set of people, apparently perfectly indifferent to "the pride, pomp and circumstances of glorious war" that surround them.
About two miles from the city, on the Leesburg turnpike, there is a large convalescent camp, where nearly three thousand soldiers are awaiting their final recovery. Many have already been forwarded to their regiments. In the city, thirteen buildings are used for hospital purposes, five of which are originally Secesh churches. There are a large number of Pennsylvania soldiers in these hospitals whose names have been published in THE INQUIRER. I am indebted to Rev. JOSEPH WELCH, Chaplain of Colonel GREGORY'S Regiment, for much valuable information concerning affairs in the city.