About two hundred miles from Cape San Antonio Light, upon the south side of Cuba, is an entrance called Fernandina Del Jauga Bay, the coast being lined with rocks of a coral formation. Ten miles from the Mexican Gulf, at the head of this bay, surrounded by a country of unsurpassed fertility, is the city of Cienfuegos, named in honor of the general to whom its present prosperity is in a great measure attributable. The fort which guards the entrance to this town impresses us with its entire inefficiency to resist an attack from our modernized implements of warfare, or to even make a show of strength for any length of time during a siege. One lone sentinel rushes upon the parapet, and presents arms, when a vessel approaches, as though he had a hundred-pound ball, which could be sent with sufficient force to sink any ship that should make an attempt to enter the port. The harbor upon which the town is situated is commodious and safe. Two gun-boats are anchored here, which, judging from their shape and size, look as though they would require assistance to advance, but are said to make six miles an hour when under full headway. They are not regarded as formidable by military men. The report from the guns would, no doubt, be more demoralizing than the effect. The houses in the city are built mostly of brick and concrete. They have no yards in front, the walls of the residences being even with the streets, only a narrow sidewalk sometimes intervening. The buildings are painted blue or green, straw-color, and white--the doors being differently colored from the houses. The windows have no glass, as it would make the dwellings warmer, and the ladies could not look from the folds of their curtains into the streets so easily without being seen as they do now. The windows are protected by iron rods and bars, which give them a cage-like appearance--the houses have no chimneys or fire-places, and the apartments are furnished in a very simple manner. The floors are made of marble and tiles--the carpet is only a large rug in the center of the room, upon each side of which are placed two rows of chairs, most of them being willow-work rocking chairs; also a center-table and sofa, with a willow back and seat, sometimes a piano, embrace the list of parlor fixtures. At night the doors and windows are thrown open for ventilation, the rooms being lighted by gas chandeliers--every thing can be seen, even to the beds on which the family sleep. The bedsteads are made of iron, and are very light, upon which is placed a wooden frame with a piece of canvas tacked across it. There are no mattresses or feather-beds used. A sheet of Canton-flannel is the first appearance of bedding, over which are spread linen sheets of snowy whiteness, pillows filled with cotton or moss--the whole being overhung with pink and white-lace curtains, to keep out the musquitoes, that never leave on account of climatic changes. But few of the dwellings are more than one story high.