CAEE OF GOLDFISH 267 



mature fish will soon begin to eat them. These 

 egg-bearing plants should be placed in pans 

 filled with water of precisely the same tempera- 

 ture as that of the tank from which they are 

 taken. Set the pan containing the eggs in a 

 window where sunlight can fall upon it and 

 leave it there until after the eggs hatch. 



Eggs of the common goldfish may be as easily 

 pressed from the female as from the trout, but are 

 troublesome to hatch. This cannot be done by the jar 

 method on account of their excessive buoyancy. The 

 only known success was achieved by J. R. Berkhous, 

 who placed the eggs on a wet flannel tray and sub- 

 merged them in only four inches of water, admitted 

 in only a slight dribble. Nearly every egg hatched. 



'Arrangements for Commercial Propagation. 

 A person who desires to go into the cultiva- 

 tion of goldfish on a large scale should have 

 commodious quarters, perfectly adapted to the 

 needs of the fish, such as glass houses and 

 outside ponds. A glass house is only another 

 name for a greenhouse such as a florist uses 

 for forcing plants, and it should be heated with 

 hot water, well ventilated and furnished with 

 concrete tanks. A house 20 feet wide permits 



