One Hundred and Tenth Street is the northern boundary of Central Park. Upon the western side of the Park, in Manhattan Square, is being gradually constructed the American Museum of Natural History, with elaborate buildings and collections already exceeding $3,000,000 in value. Near the northwestern corner of the Park, extending to One Hundred and Twenty-third Street, is the long and narrow Morningside Park, a high elevation held by massive retaining walls on the hill-slope, and ascended by flights of steps. Morningside Avenue, its western boundary, has at One Hundred and Twelfth Street what will be the largest ecclesiastical edifice in the United States, the new Episcopal Cathedral of St. John the Divine, of which the corner-stone was laid in 1892, and building slowly progresses. The splendid St. Luke's Hospital adjoins to the northward, while to the northwest, on an elevated site overlooking the Hudson River, are the fine new buildings of Columbia College in an enclosure of about twenty acres. This great University has buildings and collections valued at $7,000,000, an endowment of $12,000,000, and is attended by about two thousand students. Farther westward, upon the high ground at the edge of the Hudson River, stretches the stately Riverside Park for about three miles, making a magnificent drive, along which many handsome residences are being constructed. Near its northern end is the tomb of General Grant, a white granite mausoleum ninety feet square and surmounted by a cupola, which was finished in 1897 and cost $600,000. The interior arrangement is like Napoleon's tomb in Paris, the body, contained in a red porphyry sarcophagus, being placed in an open crypt below the centre of the dome. Beyond Central Park, the broad public roads known as the Boulevards traverse the island northward, and many elaborate structures are being erected along them. SPUYTEN DUYVEL AND CROTON.