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PIPES IN IJOXKS. 



In slate troughs, or any other for that matter, the 

 writer is perfectly convinced of the usefulness of per- 

 forated zinc as the best, safest, and most useful 

 material to hatch on ; others use a system of glass 

 guiles, and attain success thereby, but the zinc saves 

 the young fishes from falling into any dirt that may 

 have accumulated in the boxes, especially in the 

 absence of a filter, and it is, therefore, impossible for 

 them to escape, unless there be a leak in the angles of 

 the trough. The troughs are fitted by any competent 

 workman with ease and celerity, or can be supplied 

 from this or any other establishment. They must on 

 no account reach the bottom of the main trough, 

 firstly, on account of the supply pipe, secondly, to avoid 



