Adhesive Eggs. 249 



a regular beating movement like clockwork. In ten 

 days from impregnation 1,000 hatched frofh the 3,000 

 left, notwithstanding the eggs were often disturbed by 

 visitors. Six days after hatching, the sac was absorbed, 

 and I fed them clotted blood every day. My notes say : 

 'In twenty days they had all disappeared down the 

 waste pipe.' r 



The ice is scarcely out of the rivers before the perch 

 begins to spawn, and in tide water millions of eggs per- 

 ish by being left in the air at low tide, or after a freshet. 

 The mass of eggs is often larger than the fish which laid 

 them, after they have swollen, being sometimes five feet 

 long. The only provision that can be made for their 

 spawning is to put bushes in the water if there are none 

 there. The eggs may then be gathered and hatched in 

 any suitable water between 45 and 50 Fahr. 



I have since hatched yellow perch on Long Island; 

 the water there was colder than that in Albany, and the 

 hatching required a few days more. 



