76 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 chat 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. 
