176 THE TROUT 



tube, the bore of which is not large enough to admit 

 of the egg being ' swallowed.' Collect these dead 

 eggs and throw them away, not on the floor of the 

 hatchery, but at a safe distance from it. 



Be on your guard against sediment. Even the 

 best of water contains fine particles of dust in sus- 

 pension. These particles settle on the ova and can 

 be clearly detected by examination of an egg through 



FIG. it. 



a magnifying lens. It is here that a dipping tube 

 (fig. n) is serviceable. It consists of a bent glass 

 tube of large bore (| inch) with enlarged elbow, and 

 is provided, like the egg-extractor, with a rubber 

 suction-bulb. 



To remove sediment, you simply lift out the 

 hatching-tray, and thoroughly sprinkle the eggs with 

 water by means of a small watering-can fitted with 

 a very fine rose. This watering of the eggs has I 

 think a good effect, even if theie is no sediment to 

 be removed. 



With good water taken underground from a strong 



