io8 Salmon at the Antipodes. 



"which, however, was of little service, as it 

 filtered but a small quantity of water, and I 

 found it better, as the hatching was going on 

 rapidly, to dispense with filtering and make 

 use of a larger stream. The hatching-boxes 

 are at different levels, beginning at four feet 

 above the ground, and going down to two 

 feet, a fall being required from one to the 

 other. Each box is set perfectly level, and 

 the current is regulated by the depth of 

 gravel. 



Many experiments as to the best mode of 

 fish-hatching have been tried, and a very 

 efficient apparatus has been invented by the 

 late M. Coste, the great French pisciculturist, 

 consisting of a zinc or iron japanned trough, 

 having movable frames fitted with glass rods, 

 between which the ova lie suspended, allow- 

 ing any sediment or particles of hatched eggs 

 to fall through, so that they may be cleaned 

 out without disturbing the eggs. This hatch- 

 ing-box obviates the difficulty that has been 

 experienced, of a fungoid growth which is 

 apt to form on wooden hatching-boxes, but it 

 is more suited for an amateur to hatch out a 

 few ova, than for hatching large numbers. 



