90 FISH HATCHING. 



sized stones are sufficient protection. All 

 you want is darkness, whicb. is unfavourable 

 to vegetation, and your boards and your 

 slates will do all this. 



There is no objection to your lifting up the 

 stones every now and then, to see that the 

 eggs are all right, and to pick out the dead 

 ones, i.e., those that are turned white, either 

 with a forceps or a glass tube of the right 

 diameter, to catch the egg^^ You may, too, 

 brush the eggs with a soft camel-hair brush, 

 but do it gently — very gently — as moving 

 them disturbs the vivification of the young- 

 fish that is going on inside. When the egg 

 is developed, as will be explained hereafter. 



* Put your finger on tlie top of the tube, pass it down to the 

 egg you Avish to catch, take your finger off, and the egg will 

 moimt instantly into the tube. 



