HEARING 187 



the range of the whole compartment unrestricted by 

 the narrower confines of the tray. 



But before this change is made, it is very desirable 

 that the floor and sides of the box should be 

 thoroughly cleaned in every part ; for at this delicate 

 stage of the alevins' existence, the possibility of con- 

 tact with anything that is not perfectly sweet and clean 

 cannot be too carefully guarded against. The tray is 

 accordingly lifted out and suspended for a few mo- 

 ments in another box close at hand, through which a 

 stream of water is running. The compartment just 

 vacated can now be thoroughly cleaned with saucepan- 

 brush and syphon, the wire tray-supports having been 

 first removed. 



Cleaning operations over, the tray is lifted back 

 and the tiny tenants evicted in a summary fashion by 

 the simple process of turning their crib gently upside 

 down and removing it altogether. The tray is now 

 laid aside with its calico cover and wire supports ready 

 for use again next season. 



One of the advantages claimed for the deep tray is 

 that, unlike the grille, it does not allow the alevins to 

 drop through into the box beneath and disappear 

 from view one by one as the eggs hatch out, but keeps 

 them all in the tray under your immediate observation ; 

 and further, that when the time comes for the alevins 



