Chabob or PrcEixo a Pocket.—John Wren, charged with picking the pocket of James CaUahan, at Daniel Wren's saloon, on Seven teenth street, was yesterday arraigned before the Mayor. Callahan testified that he went into Wren's house on Saturday evening, took a drink, gave a five-dollar note, and received the change; and as he was about leaving, John Wren approached and ran his hand into his pocket and took out one hundred and two