THE old Shropshire canal which has long been an important feeder from the iron districts to the Severn, and which has for many years paid handsome dividends, has almost become completely useless from the numerous shafts and old works, by which it is undermined. Not more than two or three tons could be brought along it, and an almost total cessation of traffic has been the consequence. This week, however, in consequence of the heavy rains, the supply of water has been greater, and traffic has been resumed.