The pontchartrain rail-road, runs to the lake from which it derives its name, from the head of Elysian Fields street, a distance of five miles. It is a very pretty ride. This route communicates with the great northern mail line, which goes by the way of Mobile—and all the steamboats, that traverse the lakes to the various villages and landings that surround it, make this their general starting point. From here, a passage is obtained to Biloxi, which, the reader will recollect, was the first spot settled by the French in this portion of the world; and, from that circumstance, will naturally excite the curiosity of the intelligent wayfarer. At the termination of this rail-road is a first-rate hotel for the accommodation of visitors. Here is good bathing, fishing and shooting; and, beneath the shade of the trees, the breeze from the water is delightfully refreshing.

The mexican gulf rail-road, runs from Elysian Fields street, on Good Children street, towards Lake Borgne. There are twenty eight miles of this road now in operation. When finished, it will afford considerable facilities to commerce, besides great benefit to the citizens, conveying them, in about one and a half hours, to the refreshing breeze of the ocean—where fish, oysters and game may be found in abundance. No doubt it will compete with the most favored watering places of Bay St. Louis, Pass Christian, Biloxi, &c. It will also be a great accommodation to the planters in the neighborhood—who already, so far as it goes, have given it good encouragement. This road has recently been purchased of the State, by A. Gordon and Co., who, availing themselves of about 22 miles of the Nashville rail-road iron, are bringing this work to a rapid completion.

The road of bayou st. john, which follows the sinuosities of that stream, and reaches lake Pontchartrain at the site of the old fort St. John, after travelling the distance of about six miles, presents a very pleasant drive. Returning by the new Shell road before mentioned, it varies the route without adding much to the distance.

Macdonough stands on the banks of the river opposite to New Orleans; and the crossing, in the hottest weather, is generally accompanied by a slight breeze, rendered cool and pleasant by the mighty current of the river, which comes from the icy springs of the Alleghanies and the Rocky mountains. The village, of itself, possesses no great beauty—but the country, the beautiful country is all around—and the noise and confusion of the city no longer annoy you. The great attraction at this spot is in visiting the United States marine hospital, one of the handsomest structures in Louisiana, which stands a little above.

Algiers adjoins, and seems a part of Macdonough. This is the great work-shop of New Orleans, for the building and repairing of vessels. It has its dry docks, and other facilities for the most extensive operations. In business times, it presents a scene of activity that is seldom observed in any other part of these regions, and reminds one of the bustling and enterprise of the North. The period has been when Algiers prescribed the law, vi et armis, to the city itself—but the day and the disposition, have happily long since passed away.

Gretna, on the same shore, is nearly two miles further up the river, and stands opposite Lafayette. The whole distance is spotted with comfortable residences, principally inhabited by the owners of the adjoining grounds, and the walk from Algiers to this village is very gratifying to one partial to such exercise. There is a steamboat constantly plying from here to the city, which affords a desirable excursion of nearly three miles, touching at Lafayette in its passage each way. The village has a rural appearance, is regularly laid out, and exhibits some neat tenements. The forest approaches quite near; and, the idea that one may so easily lose himself in the neighboring woods, gives to the place a touch of romance which only the denizens of a crowded city know how to appreciate. From the great number of cattle observed along the shore, it would seem as if there was no necessity of diluting the milk for the New Orleans market, unless the milkmen be tea-total temperance men, and take this method to introduce the inhabitants gradually to a taste for water.

The race courses. There are three of these in the vicinity of this city. The Louisiana, near lake Pontchartrain; the Metairie, near the Shell road; and the one at Carrolton. These are as well patronised as any in the country, and, in the racing season, the inhabitants of the neighboring states, from a great distance, flock hither to participate in the sports of the turf. Much praise has been bestowed upon the arrangements on these occasions. Even here, as in many other countries, the ladies, by their presence, have given them countenance and encouragement—and the course usually is "gemmed by the rich beauty of the sunny south."

The battle ground, (formerly known as "the Plains of Chalmette,") the very naming of which causes the bosom of an American to swell with patriotic pride, lies five miles below the city. It may be approached either by the Grand Gulf rail-road, or by a good highway along the levee, the new Convent and United States barracks being within full view. But first it may be necessary to look briefly at the historical facts which give celebrity to the spot.

Early in December, 1814, the British approached New Orleans, about 8000 strong, by the way of the lakes Borgne and Pontchartrain. Their passage into the lake was opposed by a squadron of gun-boats under Lieut. Jones. After a spirited conflict, in which the killed (500) and the wounded of the enemy exceeded the whole American force, he was compelled to surrender to superior numbers.

On the 21st of Dec. four thousand militia arrived from Kentucky and Tennessee, under General Jackson. On the 22nd, the enemy having previously landed, took a position near the Mississippi, eight miles below the city. On the evening of the 23d, the Americans made a furious attack upon their camp, and threw them into disorder, with five hundred of their men killed. The enemy rallied; and Gen. Jackson withdrew his troops, and fortified a strong position six miles below the city, supported by batteries on the west side of the river. Here he was unsuccessfully assailed on the 28th of Dec. and 1st of Jan., the enemy losing two hundred to three hundred men. In the mean time both armies received reinforcements.