OBSTRUCTION. - GEORGE WALL, 18, was charged with causing an obstruction in Bishopsgate-street, by selling a card, called "Jack the Ripper's benefit card; how to catch him." When Police-constable Saer asked him for his name and address, he refused to give it him. He was taken to the station. The Alderman discharged him, as he had been locked up since Friday afternoon at half-past two.