64 PRACTICAL TROUT CULTURE. 



can not readily 'be removed. Two troughs, with 

 one set of grilles, which might be transferred 

 from one trough to the other to allow cleansing, 

 might answer ; but the tray is by far the most con- 

 venient ; it is simple, substantial, neat, and cleanly ; 

 and what more can be desired ? 



The ground around the hatching-house should 

 be made to slope away from it in every direction, 

 and should this be, from the lay of the land, im- 

 possible, wide ditches should be dug, of sufficient 

 capacity to carry off all surface-water. Our old 

 hatching-house was built at the foot of a hill, and 

 more than once, during an unusually heavy sum- 

 mer shower, have we found the water standing on 

 the floor, once to the depth of nearly a foot. 



Unless the fish-farmer is abundantly supplied 

 with cash, we would recommend that the hatching- 

 house be built as plainly as possible. We have 

 seen them of cut stone, with handsomely orna- 

 mented cornices, but are not aware that the per- 

 centage of spawn hatched in them was greater 

 than that in other and more unpretending struct- 

 ures. Inch hemlock with strips at the joints of 

 the boards is all that is required, and a good and 

 cheap roof may be made by covering boards with 

 felt paper, on which is placed a good coat of plas- 

 tic slate, or even thick mineral paint, well sanded. 

 The roof should be perfectly water-tight, as the 



