FOR PLEASURE AND PROFIT. 35 



one lake of the series. Each lake can be emptied at will, and 

 each has its range of redds, but these are used by the pro- 

 prietor only as a means of gaining possession of the fish at 

 spawning tune, as they are spawned by hand, and the ova in- 

 cubaited in a hatchery elsewhere on the estate. I need only 

 add that in the drawing the lake and dam are out of all 

 proportion, so far as size is concerned, toi the rest of the de- 

 tails. This is rendered necessary by the fact that otherwise a 

 large space would be occupied to no purpose. 



SAME, LOWER DOWN THE VALLEY. 



A isi the lake, formed by damming back the stream at B B. 

 Two things command especial attention in connection with 

 the construction of a dam first, the diverting of the course 

 of the stream, if at all possible, while the' work is going for- 

 word; second, the material. Now, in this case thei material 

 was close by, but it had to> be dug and quarried. Having in 

 mind also the two essentials of an effective trout pond com- 

 plete control, and disposal o-f surplus and flood water all four 

 conditions are realised, and the problem of the formation of 

 the ponds is solved by cutting a surplus water channel, K 1 K, 



D2 



