HATCHING APPARATUS. 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 necessary for a dozen than for one box 

 on this plan. The advantages of this apparatus are : 

 First, cleanliness, the sediment 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 

 Embryology 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 gal- 

 vanized 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 bC' 



