THE HATCHING OF OVA. 89 



very many of thera paying the penalty of their pre- 

 mature appearance ; ^ but as the days go on, they 

 increase in number, and soon a day arrives, as in 

 " the rise" of the May-fly, when Nature bends all her 

 energies to the work, and out they come by hundreds 

 and thousands ; every hour, nay, every minute, adds 

 to the wriggling tenants of your trays, and after 

 another day or two but a sparse few lazy fellows, in- 

 disposed to tempt their fate too early, remain to come 

 forth. Eemove them to some spare corner of an empty 

 tray, that they may hatch therein at their leisure. 



The hatched fish, if contained in the indoor appa- 

 ratus first described, now require to be removed to 

 rearing trays, and to be separated from the filth of 

 egg shells, dead eggs, and alevins, with the contents 

 of either burst or dead during hatching, and all the 

 deposit which usually attends the hatching process ; 

 and here it will be seen at once what an advantage 

 the French plan affords. Eemove the grille. Draw out 

 one of the corks and hold a pail under the hole, and 

 with a little assistance from a soft brush to sweep 

 the tray, the contents come into the pail. The dead 

 and refuse can then be poured off gradually, and 



* The bladder sliould run back almost to a point behind in 

 healthy yaimg lalmon ; when it is rounded too much the fish 

 seldom does welL 



