48 



PRACTICAL TROUT CULTURE. 



perature, and to the constant vibration caused by 

 the arrival and departure of hundreds of students, 

 ninety per cent, of spawn deposited on the grille, 

 as soon as the eyespecks could be distinguished, 

 hatched. To Prof. Rodgers we would here return 

 our thanks for his kindness in allowing us to 

 perform this experiment. Where several boxes 



Fio. 7." 



are nsed they are arranged in flights, the spouts 

 being alternately right and left. The above 

 engraving (Fig. 7) represents what is called the 

 single flight. The quantity of water represented 

 by the artist as rushing through the boxes and 



