PRACTICAL CARP CULTURE. 29 



strips of board on top the gate, at the curved arrow, as desired. 



The most serious defect in the whole apparatus consists in making 

 the gate E F water-tight. If the water supply is scant, a small leak may 

 lower your pond at a season when additional water can not be obtained. 

 A liberal supply of saw-dust thrown into the box may materially assist in 

 closing the leaks. It is best to make this combined overflow and draining 

 apparatus of two inch boards, and in addition to what is shown in the 

 drawing, drive upright boards deep into the clay beside the horizontal 

 box A B, and nail them fast to the box, so that no amount of heavy strain 

 in lifting and lowering the gate can displace the apparatus and cause a 

 leak. We recommend that all this wood work be thoroughly painted 

 with coal tar before it is placed in the dam. For that portion above the 

 water level it is indispensable." 



It will be found much more satisfactory to extend A far enough into 

 the pond to build a box-frame 4x4 feet wide and 2 feet high over the end O H. 

 The sides, ends and top of this box should be made of slats one inch thick 

 and one inch wide on one side by three-fourth of an inch on the other side. 

 These should be nailed on the frame with the narrow side in and the 

 wide side out, and one-fourth of an inch apart. These openings will 

 then be one-fourth inch on the outside of the box and one-half inch on the 

 inside of the box. Any debris starting through the crack will go clear 

 through and the strainer will not clog up as will augur holes. Being a 

 level surface it is easily cleaned. The qlats may be made from a plained 

 inch board. This box strainer should be anchored to well-sunk stakes at 

 its corners. This plan of straining is the result of many years experience 

 in pond culture, by George Finley, an eminent. pisciculturist, of Pitts- 

 burg, Pa., who commends it most highly, as do all others who have 

 used it. 



LEVEL... 



SLT1)IX(J (.'KXTER BOARD. 



(i. Water Level. 



II. Kmhankmcnt or dam. 



D. D. A tube passing under the dam. 



A Strainer box over inlet K. oi' tube, to prevent the escape offish. 



B. C. Perpendicular tube at right angles to D. D., with F., a partition dividing it 

 across in the center. The water entering at A. follows the arrows and passes through D. 

 1). to outside of dam. 



F. is a sliding center board, to be raised or lowered at will. 



A modification of the method in use in the Forest Park pond* and 



