The accumulated decayed matter ought to be occasionally removed. The frequency of this depends on character of the water supply, the amount of silt it brings into the ponds, the character of the soil, and on the thoroughness of the yearly removal of the surplus vegetation. Care should be taken that the ponds do not become offensive with stagnant water and rotten vegetation. This condition is detrimental to large production; while abundant pond vegetation is favorable to a large production of fry it must not become decayed. It is sometimes so luxuriant that it settles down in a blanket-like mass and smothers and pens in many of the young Frogs. Under such conditions it should be removed frequently. This can be done by lowering the ponds, if they are built so they can be drawn off, which is a very desirable and convenient way if the topography of the land will permit. A strong flat-bottom boat should be made, in which can be taken the surplus matted vegetation and carried off. At each end of the boat a ring should be fastened, through which stakes can be driven to hold the boat at points in the pond to be worked. The vegetation is raked from the water in small lots. Care should be taken not to bring up any of the small Frogs and Tadpoles with the vegetation. It should be removed from the banks of the ponds at once, as it will rot very fast, and its presence is objectionable. If a boat is not used the vegetation can be drawn near the shore with long-handled rakes and taken out with long-handled pitchforks made especially. This method is simple and much more economical. Two men can accomplish more than five men by the other method. The advantage in favor of the boat is that you do not need to disturb the whole mass, but pick it out here and there as you think best, and have it more uniform and not destroy the roots so much. Great Profit in Swamp Lands.