24 Trout Culture. 



A good strong framework must be arranged 

 to support the troughs, of whatever material 

 they are constructed. It should resemble 

 a staircase, the steps being of the width of 

 the troughs, and arranged at such a height 

 relatively to one another that the spout of each 

 trough may properly deliver its water into that 

 below it. 



When filling up an apparatus Mr. Edon sug- 

 gests that a lead pipe should be attached to the 

 water supply and carried along the whole length 

 of the back inner edge of each trough, being 

 twisted over the ends and so brought down to 

 / the trough below. The other, or free end, is 

 squeezed together with pincers, and thus closed 

 water-tight. Small perforations are then made 

 with a fine pointed awl or other instrument, and 

 this gives a thorough aeration to the whole of 

 the water in each trough, and an equal supply 

 of fresh water throughout the apparatus. In 

 slate tanks or troughs the pipe may be fastened 



