Show cotton brokers before jury new york A sensation was caused the new york cotton exchange when it became known on tuesday that a number of members of the ex hange had been subpoenaed to ap pear before the federal grand lury one rumor was that the subject under investigation was the trading of a very large speculator in connection with advance information secured by the speculator on government crop es images it is generally understood arat the men summoned will be ques boned as to the methods ot fixing the grades of cotton deliverable on the ex hange |