A short distance from the Dairy is the children's summer house, near which is a cottage with toilette rooms, closets, etc., for the use of ladies and children. Near by are a number of self-acting swings, and a little to the north is the Carrousel, a circular building, containing a number of hobby-horses, which are made to gallop around in a circle by the turning of a crank in the centre of the machine. To the west of this building is the base-ball ground, covering some forty or fifty acres. A commodious brick cottage has been erected here for the accommodation of the ball players. The paths from the Fifty-ninth street gates converge at the Marble Arch, which lies a little to the northeast of the Dairy. This is one of the most beautiful and costly structures in the park, and consists entirely of marble. Its purpose is to carry the main carriage drive over the foot-path without interrupting the level, and at the same time to furnish a pleasant access from the lower level of the Southwest Park to the Mall. A broad double stairway, to the right and left, leads from the Mall to the interior of the Arch. On either side runs a marble bench, on which, in the summer, the visitor may sit and enjoy the delightful coolness of the place; and opposite the upper end of the Arch, beyond the stairway, is a niche, around which is a marble bench. In the centre is a drinking fountain. The Mall extends from the Marble Arch to the Terrace. It constitutes the grand promenade of the park, and near its upper end is the handsome music stand, from which concerts are given by the Central Park Band, on Saturday afternoons during the mild season. The Mall is about 1200 feet long by 200 feet wide. In the centre is a promenade, thirty-five feet wide. The remainder is laid out in lawns, and is shaded by four rows of American elms. The Mall terminates on the north in a spacious square or plaza, which is ornamented with two pretty revolving fountains, and a number of bird cages mounted on pedestals. In the spring and summer, numerous vases of flowers are placed here. On concert days, the upper part of the Mall is covered with rustic seats shaded by canvass awnings, where the visitor may sit and listen to the music. At such times, a large programme of the performance is posted on a movable frame placed opposite the music stand. These concerts are very good, and draw large audiences. To the west of the Mall is a beautiful lawn, called the Green, covering fifteen acres, and terminated on the northwest by a hill, on the summit of which is placed a gaudy building in which artificial mineral waters are sold. Along the northeastern side of the Mall, and elevated about twenty feet above it, is a rustic bower of iron trellis work, over which are trained wisterias, honeysuckle, and rose vines. This is the Vine-covered Walk, and from it visitors may overlook the Terrace, Lake, Ramble, and Mall.