CASTLE ISLAND--BOSTON HARBOR That Bostonians are thankful people truly appreciating their public blessings is amply proved by the way in which they turn out to Fort Independence, Castle Island, now a part of the Marine Park of their city, for the fresh air and unexciting recreation it offers. Other citizens of other cities create parks from their historic places and, then, content to know that they have them when they want them, allot the day and night watchmen entire seclusion in these domains. With Bostonians it is different: On any bright and cheering day throngs can be found at the old fort, of various classes and of widely sundered poles of thought; but joined together in one great common heritage, a capacity for making use of that which they have and of taking their pleasure in a devout and noiseless manner not to be seen amongst the habitants of any other great American city. It is a pleasant place, Castle Island, and the air there on a sunny day sweeping in from the great reaches of Boston’s environing waters is a true elixir. The views in various directions are entrancing, showing, in one direction, wide expanses of blue with dim islands in the distance and cottony clouds overhead; in another, the shipping and sky-line of Boston harbor and the jumbled city. Geographically stated, Castle Island is a body of hard, rocky land, most of which is occupied by the historic old fort, and it is situated three miles from the head of Boston Harbor and two hundred yards from City Point, South Boston, to which it is connected by a wooden causeway. On the mainland, close at hand, lies Boston’s famous Aquarium, where the flying fishes play! Viewed from the head of the causeway, the fort is a very gay and martial figure though in sober earnest it has never fired a shot in anger in its life. Structurally speaking, it is a pentagonal, five-bastioned enclosure whose granite walls occupy all of the crest of the eminence which makes up the island. To the right, from this stand-point, one sees running off a long thin shallow strip of gravelly sand, which geologists assert has been a gift from the sea since the erection of the fort. Originally, they say, the main portion of the island was larger than it is now; so what was taken from one place seems to have been added on to another. [Illustration: FORT INDEPENDENCE FROM THE WATER, BOSTON, MASS. Floating Hospital in Foreground]