34 THE GOLDFISH AND ITS CULTURE. 



these movable parts the level of the water in the pond can be 

 regulated as occasion may require. The overflow, that is, where 

 the water is running out, is guarded by a -wire screen of the same 

 sized mesh as before mentioned, and adjustable in the same manner 

 as the other boards protecting the opening. 

 When it is desirable to drain the pond, one 

 section or board is removed at a time, always 

 taking care to place the wire screen .upon 

 the top by letting it slide down into the 

 grooves. (See illustration.) 

 OUTLET FOR POND. A most important point, and one to be 



insisted upon in the construction of ponds, is to so arrange the water 

 supply that it will at all times be under complete control. Each pond 

 is to receive its supply independently of all the rest, and the- water 

 must also, when need be, be cut off from the pond without inter- 

 fering with the supply of others. The supply channel must likewise 

 have an independent "run," so that the water it contains when not 

 wanted for use in the ponds, may find its way out of the establish- 

 ment. This point is one of great importance, especially during heavy 

 rain-storms, as the large increase in the volume of water would cause 

 the ponds to overflow and probably do great damage. 



