September brings the return tide of a surging population. The great heat of the season has passed, vacations are ended, and nearly every resident is anxious to see how it looks in New York. Teachers of the public schools, and scholars who have been luxuriating amid the shades and glens of the green mountains, return to resume their labors and studies. Churches, refitted and refurnished, are opened with impressive and attractive services, and glad pastors and people exchange their mutual congratulations. The wholesale dry-goods trade has already opened, crowding many of the down-town streets with such piles of new boxes that the pedestrian can scarcely pass. New stores are opened with brilliant windows, new books and styles announced, and handbills profuse as the leaves of autumn spread in every direction. The markets abound with fruits and vegetables of every description, and from every part of the country, rich and luscious; but, however plentiful, through the perverseness of the middlemen, they are always costly here. Autumn is preeminently the season for music, promenade, and parade. Music is much. cultivated in New York. Singing is taught in the public schools, the Sabbath-schools meet twice, devoting most of one session to singing, so that children with little talent in that line, by this long-continued drilling, nearly all learn to sing. In autumn one is attracted by music at the park, music at the school, music at the church, concert, theater, in the companies, and the members of various societies, parade the streets, or ride after richly caparisoned horses, wearing unique uniforms, filling the air with strains of music. Organ-grinders, from every nation, and of every age, multiply at every corner, to the disgust of merchants and householders. At this season hundreds, of persons from the surrounding country flock to the city in quest of situations, but failing to obtain them, depart in disappointment, or linger to swell the ranks of vagrants and criminals. Cold weather seldom arrives earlier than December, leaving three delightful months for business, study, and pleasure. The climate during the whole of autumn is, bracing, cheerful, and bland beyond all description.