ARTIFICIAL HATCHING. 81 



I may here venture to add that the distinguished gentleman 

 I have just named, is inclined to incredulity as regards the exist- 

 ence of a distinct species of Parr. 



I shall now recur to the experiments on the ova of Salmon ; 

 first, for the purpose of showing how they may be brought into 

 direct practical utility, and rendered subservient to the pleasure 

 of the angler, as a method of stocking inland waters; and, 

 secondly, of pointing out how easily experiments might be 

 made in this mode, as to the hybridisation of fishes, and the 

 rearing new species of mules, or ascertaining that they cannot 

 be reared, by the commixture of the milt and roe of various dis- 

 tinct species of the same farail}^ in small tanks, fed by running 

 brooklets. 



It has been shown above, that the impregnated spawn of any 

 two live breeding fishes of the same family may be artificially 

 hatched and preserved in waters other than those in which the 

 parent species are wont to live; as even the Salmon in fresh 

 water. 



I shall now proceed to show that the same result may be 

 obtained by the commixture of the milt and roe, in aerated 

 water, of dead fishes recently taken. 



It is absolutely necessary that the water should be aerated, or 

 highly supplied with oxygen. For it is for the purpose of finding 

 water in this condition, that the Salmon, the Shad, the Bass, 

 the Smelt, and all those fish which resort to fresh waters for 

 the purpose of spawning, run to the shallow, pure, and swiftly- 

 flowing brooks, to which their rapidity and frequent falls impart 

 purity and vitahty, by mingling them with the atmosphere. In 

 the same manner, the fish of the sea resort for the deposit of 



