FISHING WITH SLEDGE HAMMERS. -- A person, writing from Frankfort, Kentucky, to an Eastern editor, states a new mode of fishing which is practised in the small streams of Kentucky during low water.  It is termed "sledge hammering," and is performed by a man wading about with a sledge hammer on his shoulder, and to every rock which he approaches he gives a violent blow with his hammer.  The stunned fish rise from beneath the rock to the surface and are basketed.  (We have heard that a similar system is adopted by the poachers in the rivers of this neighbourhood. -- Ed. C.P.)