196 AMERICAN FISH CULTURE. 



cultivation of the salmon, I was not aware that so spirited 

 and praiseworthy an undertaking as the one alluded to was 

 contemplated, and gladly make this digression to commend 

 it. The necessity of manipulating salmon on the stream 

 and transporting the spawn immediately after impregna- 

 tion, when the ova are so apt to lose their vitality by being 

 agitated, and not allowing sufficient time in hatching- 

 troughs for the early development of the young fish in the 

 eggs, has been almost the only bar to the success of those 

 who had the task of introducing salmon into the rivers of 

 New England. It is a matter of gratulation that this diffi- 

 culty is about to be obviated. Not having Mr. Stone's 

 letter at hand at the time of writing this, I am unable to 

 say whether it is an enterprise of his own, or of the New 

 England Fish Commissioners, but shall throw some light 

 upon the question in an appendix. 



Thymallus. To this genus belongs the English gray- 

 ling. Dr. Richardson, in his " Fauna Boreali- Americana," 

 gives an account of two species. Another has lately been 

 discovered in some of the affluents of Green Bay. It is 

 described as a fish of rare beauty and excellence. While 

 on a trout-fishing excursion lately in the north-western part 

 of Pennsylvania, I met with a very intelligent, though not 

 scientific person, who informed me that he, last summer, 

 while exploring some timber lands on the Oconto and Au 

 Sable (though I can find no such stream as the latter on 

 the map), met with a new kind of trout, which he had 

 never seen before. From his description it was, doubtless, 

 this new species of Thymallus. He informed me that it 



