CRAIGEND HATCHING-ROOM. 



145 



and buds or leaves are borne down against the outlet screen. The 

 wire-netting collects these at the surface, and the suction of the 

 sluice causes them to pile up several inches above the water. The 

 weight sinks the first-formed debris at least to twice the depth 

 below water it is piled above ; but after a certain depth has been 

 reached the rest of the flotage collects in front. The screen, being 

 of a size determined by the amount of flow over the sluice, is 

 sufficiently deep to offer an ample surface for the free passage of 

 the water, and all is safe. At Craigend dam once a week is now 

 found often enough to clean this screen. The rearing-boxes were 

 removed years ago when the house in the Howietoun Fishery was 

 built. 



CRAIGEND HATCHING-ROOM. 



The house at Middlethird was so far from Craigend that I 

 altered the gun-room so as to fit it for experiments. From the 

 dam there was a supplementary water-supply, which could be 

 connected with the house (filtered) water at pleasure. This I 

 turned on to the house pipe, and outside the gun-room window I 

 tapped the pipe and led a branch under the gun-room floor. The 

 branch ended in a Y-upright, on which two rubber hose were 

 attached ; one of these I led to a 



SMALL SLATE CISTERN, 



the other to a tap on opposite wall. The cistern was built on a 

 slate slab, grooved to receive the sides ; and bored for two 



Fio. 102 scale 

 K 



