74 



DOMESTICATED TROUT. 



who have used it. Below will be found the Patent 

 Office specification of this invention. 



" The object of my invention is to provide a simple and 

 convenient method of fish-spawn hatching, which may be 



practically carried on during the winter season. Its nature 

 consists, mainly, in the employment, in connection with the 

 spawn trays, of an upward current or flow of water through 

 the layers of spawn, affording a thorough and constant cir- 

 culation of fresh water through the same. 



"In the drawing, Fig. I is a vertical central section of 

 one case of trays. Fig. 2 is a top or plan view of the same. 



