94 



SEASON 1873-74. 



bottom. It was made 2 feet wide inside measurement (Fig. 36), 



and the bottom was carefully jointed and slip-feathered, the 



grooves being thickly painted with red 

 lead. To economise height, the inlet 

 screen was sunk level with the top of 

 the sides, being supported on fillets. This 

 screen was made like a leaf-screen, covered 



with perforated zinc. 



Lids were made with frames of l^-inch wood, between which 



fine wire-netting was stretched (Fig. 37), and one lid was hinged 



Fid. 36 scale ,&. 



FIG. 37 scale ,&. 



to the other, so that the uppennost could fold back on the lower. 

 This was held in position by two iron angle-pieces, from below 

 which it could be easily slipped forward and removed, but only 

 when the upper lid was folded back. 



Two padlocks were used ; fish-breeding being a new thing to 

 the natives, their curiosity had to be restrained by due precautions. 



The outlet (Fig. 38) was guarded by No. 7 

 perforated zinc, and was cut down within 

 3 inches of the bottom ; thus a strong 

 current was produced even when the flow 

 of water was slight, and when the supply 

 was plentiful the depth was easily in- 

 creased by placing a piece of flannel on the outlet. Fig. 39 is a 

 longitudinal section of the 9-feet plank pond. In it I placed 

 some great lake trout eggs in two of the slate trays. When the 

 fry hatched out they passed freely into the plank pond. The 

 perforated zinc I had fastened on the outlet was quite small 



FIG. 38 scale ,. 



