The Florida seacoast is usually protected by sand beaches which are quite hard, and are separated from the mainland by interior lagoons. The mangrove and the coral, constantly growing, are ever encroaching, however, on the sea-waters, and thus Florida seems to have been constructed. The country is full of water courses, lakes and springs, some of the latter being regarded as among the most remarkable in the world, the famous Silver Spring near Ocala being estimated as discharging three hundred millions of gallons daily. There are countless springs along the coasts, and one of these bursts up in the sea near St. Augustine, two miles off shore, with a torrent so vigorous that the ocean waves break over the column of fresh water as if it were a sunken reef. Scientific investigators are amazed at the vast amounts of water everywhere visible and discharged from these springs, and with only the narrow and low peninsula for a watershed, the problem as to where the vast water supply comes from baffles solution. Some of the Florida lakes are subject to remarkable fluctuations of level, and one of them, Lake Jackson, ran suddenly dry at the time of the Charleston earthquake in 1886, but after a few weeks the water began returning, and it soon resumed its natural proportions. CUMBERLAND SOUND. The memory of the Duke of Cumberland, son of King George II., the victor of the battle of Culloden, in Scotland, where he defeated the Pretender in 1746, is preserved in America in the name of Cumberland Sound, the finest harbor on the Southern Atlantic Coast. St. Mary's River, coming out of Okifenokee swamp to make the northern boundary of Florida, flows an erratic course, boxing the compass in every direction until it finally heads eastward and debouches in Cumberland Sound, among a group of islands forming a large landlocked harbor. This river and sound, the boundary between Georgia and Florida, were, prior to the Revolution, a disputed frontier between the English and the Spaniards. To the northward of the entrance from the sea is Cumberland Island in Georgia, then comes Jekyll Island, with its magnificent club-house and elaborate cottages, and then St. Simon's Bay, having as its chief port the busy lumber-shipping town of Brunswick. To the southward of the Cumberland entrance is Amelia Island in Florida. The sound behind Amelia and Cumberland Islands is a magnificent roadstead, capable of floating at safe anchorage an enormous fleet. Amelia Island is a long, narrow sand bank with much foliage upon it, stretching about fourteen miles down the Florida coast to Nassau Sound. On the sea front of this island is one of the finest sand beaches on the Atlantic. Behind it is the arm of the sea known as Amelia River, and the port of Fernandina, thirty-six miles northeast of Jacksonville, having at the point of the island, guarding the entrance to its harbor, old Fort Clinch, a superannuated brick-work battery, formerly of great importance, but now of little