HATCHING APPARARUS. 65 



and after passing through the box it can be caught and 

 used over again. If water has been laid in the house, a 

 constant stream of fresh water can be kept flowing with 

 less trouble by using a discharge-pipe instead of a receiver. 

 In one such box a thousand eggs the product of a single 

 trout may be hatched. It will require no more attention 

 than a globe of gold-fish, far less than an aquarium, afford 

 a far more interesting study than either, and be quite as 

 much of a parlor ornament. 



" If it is desired to experiment more largely, this box 

 may be duplicated interminably, as has been done by Mr. 

 Coste, in perfecting his apparatus in use at Huningue. No 

 greater supply of water and very little more room is neces- 

 sary for a dozen than for one box on this plan. The ad- 

 vantages of this apparatus are : First, cleanliness, the sedi- 

 ment being easily removed without disturbing the eggs ; 

 secondly, the eggs can at all times be readily examined ; 

 and thirdly, the fry or young fishes can be removed from 

 one box to another with facility, thus leaving room for 

 more eggs in the first boxes. 



" These trays, invented by M. Coste, Professor of Em- 

 bryology in the College of France, have been used during 

 the past season at my ponds with perfect success, and it is 

 intended in future to hatch all our spawn in them. The 

 boxes are made of the best galvanized sheet-iron, and are 

 coated inside and out with asphalt varnish. The grille is 

 composed of strong glass tubes, firmly fastened in a frame 

 of black walnut. This is so arranged that should any of 

 the tubes become broken they can be readily removed and 

 others substituted. Each box will hatch from one thousand 

 to fifteen hundred eggs. 



"Prices of Coste Hatching Trays. 



" Single trays $4.00 



One dozen trays 45.00 



