FISH HATCHING ON A MODEST SCALE 419 



Against the left wall are two boxes end to end. Two 

 groups of four boxes each, arranged end to end in pairs, 

 occupy the central floor space, while against the right 

 wall away from the door is one box. The space left 

 on this side near the door is useful for tackle. The 

 boxes stand on frames at a convenient height from the 

 floor, and as at Luss the water supply enters from the 

 rear, the tier of six boxes farthest from the door is on 

 a higher level by the depth of a box than the tier of 

 five nearest it, each upper box draining into the one 

 set beneath. At Luss the six higher level boxes are 

 fitted with glass grilles for carrying the ova, while the 

 four central boxes of the lower tier are fitted with per- 

 forated zinc baskets. 



To trace the water system more precisely, the supply 

 is delivered from a continuation of the main J in. 

 lead pipe within the hatchery to each of the six upper 

 boxes. Separate connections with this pipe are made 

 for each box, the taps being finished with -f in. nose- 

 cocks ; after serving the upper boxes the water flows 

 over lipped slots to the lower tier, whence each box 

 drains to a common lead waste pipe carried beneath the 

 flooring through the doorway to a fireclay drain pipe 

 leading to the river a few paces away. The supply 

 of the lower tier of central boxes is, by a separate 

 connection with the main inside the hatchery, supple- 

 mented by block tin tubes fixed inside the boxes per- 

 forated with needle points about one half-inch apart. 

 The tubes are carried round the upper inner edges of 



