XCYIII 



against tlie accmiinlation of sediment or other obstnic- 

 tiye matter. 



The collector, C as is slioA\-n in the x>lates, should be 

 placed at the lowest point in the pond : and, unless ex- 

 cavated in very hard clay soil, should be both floored 

 and faced with plank, cement or other hard material. 

 The Carp, it will be remembered, have a strong tendency 

 to bury themselves in the mud not only during their 

 periods of semi-hibernation, but whenever suddenly 

 alarmed or closely pursued : and if the collector has been 

 -constructed as suggested, and the hsh are gradually drawn 

 into it with tlie subsiding water, all danger of loss on 

 this account will be obviated. 



The details of the "overflow." ''outlet,'' "collector," 

 &c., may. of course, be somewhat varied, according to 

 circumstances : but the general requirements of a pond 

 so located as to receive its suiDi3ly of water at one end, 

 and to discharge it at the other, are believed to be fully 

 answered in the foregoing description. 



Ponds in this latitude should be not less than three 

 feet in depth at their dee^Dest X3art — to insure the flsh 

 .against being frozen in severely cold weather — and should 

 gradually shoal in places to a depth of one or two inches 

 to x^rovide the shallows required for spawning purposes. 

 Small knolls and islands should be levelled or removed, 

 as they generally afford harboring places for the enemies 

 'of fish, 



Po:n^ds i^' Tidal Regions. 



It having been remarked in another connection that 

 ponds formed by the reclamation of marshes in tidal 

 regions might also x)rove well adapted to the cultivation 

 of the CariD, the following suggestions are added with 

 especial reference to the peculiar location of such ponds. 

 The collector and drain ditches should be constructed 

 and arranged in accordance with the instructions already 

 given — the collector being formed, of course, at the low- 

 cest point within the embankment. 



