HATCHING-HOUSES AND APPARATUS. 



49 



falling in a graceful parabolic curve to the floor, 

 is entirely too great ; a slight stream, which has 

 been described as a severe trickle, will be all that 

 is required. 



As the boxes have an average capacity of fifteen 

 hundred spawn, seven thousand five hundred can 

 be hatched in a flight of five boxes, occupying a 

 space of but twenty-one by thirty-one inches ; 

 while the double pyramidal flight (Fig. 8), eight 



Fio. 8. 



feet by three, will accommodate about twenty thou- 

 sand spawn. In the Troutdale hatching-house, 

 of the interior of which a cut is presented (Fig. 9) 

 on the following page, it will be seen that along 

 the wall, to the right and left, these" trays are 

 arranged in double, lateral flights, the water enter- 

 ing from a two-inch pipe directly from the spring 



3 



