Attempt To Destroy One Of The Canal Locks - A bold and most infamous, but unsuccessful, attempt was made, on the night of Thursday the 9th inst., to destroy the upper lock, at Allanburgh, on the Welland Canal, by means of gunpowder. It appears that two kegs of powder, of 25 lbs. each, had been sunk by means of a sand bag, at the head of the lock, having 3/4 inch leaden tubes fitted into the head of the kegs, and reaching aabove the surface of the water - through these tubes patent fuse was inserted, and at about 11 o'clock, P.M., set fire to. After a tremendous explosion, it was ascertained that one of the head gates of the lock was entirely destroyed. Fortunately, the guard gate, placed about 50 feet above this point, immediately closed itself, in consequence of the rush of water through the injured lock, and no further damage occurred. Space gates being at all times on hand, ready for use, in case of accident, the old one was replace, by noon the following day, and the navigation has since continued without interruption, as usual. A reward of £100 is offered by the superintendent for the discovery of the offenders, as will be seen by a notice to that effect in our advertising columns: exertions of all good citizens, will prove succcessful in bringing those mescriants to justice.