F. E. Sickles has petitioned for an extension of his patent for opening and closing valves of steam engines, which expire on the 19th of October, 1858. The petition will be heard on the 4th of October next, and all persons opposing the extension are notified to show cause, if any they haye, why it should not be granted. The testimony will be closed on the 20th of September, and rules for tnking the snme can be had by addressing the Com- , missioner.