56 THE NEW 'AET OF BREEDING FISH.' 



this hatching apparatus, in order that landholders who 

 desire to stock their streams, may have similar ones 

 made. It is formed of several small parallel canals, 

 disposed in steps on each side of the principal one 

 at the top, which supplies them all. 



■After having furnished each one of these canals 

 with a willow hurdle, secured ahout an inch below 

 the surface of the water, the machine is placed un- 

 der a cock, so that the water, when turned on, will 

 run into one end of the highest canal. The current 

 will run to the other end, and there find two lateral 

 openings, through which it wiU flow, right and left, 

 in two little falls, into the next two canals. Through 

 the length of these it will flow in an opposite direc- 

 tion, and find at the other end openings through 

 which it wiU again fall into other two canals, on a 

 lower plane, and thus from fall to fall, it may pass 

 through any number of compartments, or artificial 

 streams, we may require. 



When the machine is in operation, we deposit on 

 each of the hurdles placed in these artificial streams, 

 the eggs to be hatched, the different kinds of which 

 may be separately placed in the different compart- 

 ments. The current must continually flow over them 

 of the depth of an inch, which is sufficient to hinder 

 the formation of byssus, a kind of vegetation which 

 often destroys them, and from which in this way it 

 is easy to free them as step by step all their changes 

 are noticed. 



By these artificial means eggs are developed and 



