At about the time that Castle Williams was being constructed, a similar work was in erection just off the Battery, Manhattan, on a ledge of rocks now a part of the city itself. This was Fort Clinton, which is the Castle Garden, or Aquarium, of the present day. Fort Jay and Castle Williams, Fort Clinton and the Battery were the outing places of New Yorkers before the Civil War. To the Island or the Battery did the residents of the city repair for air and recreation on holidays and Sundays. An illuminating picture of this phase of the city’s life is drawn by Abram C. Dayton in his “Last Days of Knickerbocker Life in New York.” “Castle Garden, the legend says,” he writes, “was created to protect the city against invasion. Whether these invaders were to be New Jersey Indians armed with bows and arrows or Staten Island pirates bent upon destruction with popguns and firecrackers is not related; but it is certain a very limited force would have been required to effect an entrance through its brick walls. About the time we write of its loud-mouthed armament had been removed” (about 1860): “it had been placed by special orders from somewhere on a peace footing. It was neither a concert saloon, an opera house, nor a receptacle for needy immigrants; but the old white-washed barn was devoted to the restaurant business on a very limited scale, as ice cream, lemonade, and sponge cake constituted the list of delicacies from which to select. The ticket of admission required to pass its portcullis cost one shilling; but that was a mere form instituted to guarantee perfect decorum, for it was redeemed as cash in exchange for either of the above specified articles of refreshment. At the close of a summer day its frowning battlements were crowded with listeners eager to catch a strain of martial music wafted from Governor’s Island. “Rabineau’s swimming bath was moored to the wooden bridge which connected the old fort with the Battery grounds; and on its roof protected by an awning might be seen, after banking hours on summer afternoons, substantial citizens comfortably seated and refreshing themselves after their bath with the sea breeze, accompanied by mint julep and sherry cobblers.” Prior to 1852, Fort Columbus was for several different short periods of time empty of troops, but since that year it has always contained a garrison. In addition to being the head-quarters of the Department of the East, the old post is now used as a military prison and as a landing-place for the aërial branch of the army. A visit to Governor’s Island to-day is a pleasant excursion for a stranger in new New York and the port would be a new sight for most New Yorkers, so unfamiliar are familiar places to those who are closest to them. One must have a pass from the military authorities at the island to go through the old works, but this can be secured upon written application without great difficulty by any citizen of the United States.