§ 324. Penalty of conversion of floating lumber. Whoever shall convert to his own use, without the consent of the owner thereof, any logs, timber, boards or plank, floating in any of the waters of this state, or lying on the banks or shores of any such waters, or on any island where the same may have drifted, shall, for every offense, forfeit to the owner of such logs, or other lumber, three times the value thereof. Nothing contained in this section shall be construed to extend to that kind of lumber called driftwood.