Trenton, the capital of New Jersey, is thirty miles from Philadelphia, a prosperous city with seventy thousand people. The first and most lasting impression many visitors get of it is of the deep rift cut into the clays and gravels of the southern part of the town, to let the Pennsylvania Railroad go through. Here, as everywhere, are displayed the lavish deposits of the "Trenton gravel" as the railway passes under the streets, and even under the Delaware and Raritan Canal, to its depressed station alongside Assunpink Creek of Revolutionary memory, the chief part of the city spreading far to the northward. Trenton is as old as Philadelphia, its reputed founder being Mahlon Stacy, who came up from Burlington Friends' Meeting, while the settlement was named for William Trent, an early Jersey law-maker. The Trenton potteries are its chief industry, established by a colony of Staffordshire potters from England, attracted by its prolific clay deposits; and the conical kilns, which turn out a product worth five or six millions of dollars annually, are scattered at random over the place. Their china ware has been advanced to a high stage of perfection, and displays exquisite decoration. The Trenton cracker factories are also famous. The finest building is the State House, as the Capitol is called, the Delaware River's swift current bubbling over rocks and among grassy islands out in front of the grounds. At Broad and Clinton Streets, the intersection of two of the chief highways, mounted as an ornament upon a drinking-fountain, is the famous "Swamp Angel" cannon, brought from Charleston harbor after the Civil War. This was one of the earliest heavy guns made, plain and rather uncouth-looking, about ten feet long, and rudely constructed in contrast with the elongated and tapering rifled cannon of to-day, and it rests upon a conical pile of brownstone. It was the most noted gun of the Civil War, an eight-inch Parrott rifle, or two-hundred-pounder, and, when fired, carried a one-hundred-and-fifty-pound projectile seven thousand yards from a battery on Morris Island into the city of Charleston, which was then regarded as a prodigious achievement. It is a muzzle-loader, weighing about eight tons, and burst after firing thirty-six rounds at Charleston, in August, 1863, the fracture being plainly seen around the breech.