On a bright moonlight night in the summer, the scene to be witnessed on the lake is brilliant. The clear waters gleam like polished steel in the moonlight, and are dotted in every direction with pleasure boats, each of which carries a red or blue light; the swans sail majestically up and down in groups; on every side is heard the dash of oars, and the sound of laughter and happy voices; and the air is heavily laden with the perfume of the flowers along the shore. No sight or sound of the great city is at hand to disturb you, and you may lie back in your boat with half shut eyes, and think yourself in fairyland. [Picture: THE TERRACE, AS SEEN FROM THE LAKE.] In the winter the scene is different. Huge houses are erected on the shores of all the sheets of water in the park, and are provided with sitting-rooms, fires, restaurants, and counters at which skates may be hired for a trifling sum. The water is lowered to a depth sufficient to prevent the occurrence of any serious accident in case the ice should break, and the ice itself is carefully watched, and is scraped smooth after the sports of the day are over. Rotten ice is quickly detected and marked with a sign bearing the word "Danger." When the ice is in suitable condition, a red ball is hoisted on the Arsenal, and little white flags, on which is printed a similar ball, are affixed to the cars running between the park and the lower part of the city. Then the pleasure seekers come out in throngs, and soon the ice is crowded. At night the lakes are lighted by numerous gas jets with powerful reflectors, placed along the shore. The Central Lake at such times is a sight worth seeing. The Commissioners prepare a code of liberal rules for the government of skaters, and post them at conspicuous points. All persons going on the ice are required to comply with them, on pain of exclusion from the sport. To the east of the Central Lake, and along the Fifth avenue side, is a small pond, on the verge of which a large Conservatory, which is to be one of the principal ornaments of the park, is now in course of erection. On the heights to the north of the lake lies the Ramble, which covers an area of about thirty-six acres, and is a labyrinth of wooded walks, abounding in the prettiest rustic nooks, with tiny bridges over little brooks, wild flowers and vines, and bits of lawn, and rock work, all so naturally and simply arranged that it is hard to believe it is not the work of nature. It is one of the most beautiful portions of the park. At the northern end of the Ramble rises a fine gothic stone tower, which forms a prominent feature in almost any view of the park. This is the Belvedere, and is intended to serve as an observatory from which the entire park may be seen at a glance. The rock upon which it stands is the highest point in the park. [Picture: VIEW ON THE CENTRAL LAKE.]