Boston's Belgravia occupies a district which has been reclaimed from the waters of the "Back Bay" of the Charles River,--on whose shore Hawthorne placed the shunned and isolated thatched cottage of Hester Prynne in "The Scarlet Letter," and the windows of many of Boston's Four Hundred overlook the same delightful vista of water, hills, and western skies which to the sad eyes of Hester and little Pearl were a daily vision. On the water side of Beacon Street, within this select region, is the four-floored, picturesque mansion of brick--its front embellished with a growth of ivy which clusters about the bay-windows--where not long ago we found the gentle and genial Holmes sitting among his books, serene in the golden sunset of life, happy in the love of friends and in the benedictions of the thousands his work has uplifted and beatified. The mansion is redolent of literary associations, and throughout its apartments were tastefully disposed articles of virtu, curios, and mementos--literary, artistic, or historic--of affection and regard from Holmes's many friends at home and abroad. His study was a large room at the back of the house, occupying the entire width of the second floor. Its broad window commands a sweep of the Charles, with its tides and its many craft, beyond which the poet could see, as he said, Cambridge where he was born, Harvard where he was educated, and Mount Auburn where he expected to lie in his last sleep. We last saw the "Autocrat" in his easy-chair, among the treasures of this apartment, with a portrait of his ancestress "Dorothy Q" looking down at him from a side wall. His hair was silvered and his kindly face had lost its smoothness,--for he was eighty-five "years young," as he would say,--but his faculties were keen and alert, and, in benign age, his greeting was no less cordial and his outlook upon men and affairs was no less cheery and optimistic than in the flush and vigor of early manhood. In this luxurious study were written several of his twenty-five volumes,--"Over the Teacups" being the most popular of those produced here,--and we found him still devoting some hours of each day to light literary tasks, oftenest dictating materials for his memoirs, which are yet to be published.