70 



SALMONIA. 



they had been made by the impression of the 

 fingers of a hand; and hence the fish is 

 called in some places Jingerling, The river 

 and sea trout seem capable of changing per- 

 manently their places of residence ; and sea 

 trout appear often to become river trout. In 

 this case they lose their silvery colour, and 

 gain more spots ; and in their offspring these 

 changes are more distinct. Fish, likewise, 

 which are ill-fed remain small ; and pars are 

 exceedingly numerous in those rivers where 

 they are found, which are never separated 

 fi'om the sea by impassable falls ; from which 

 I think it possible that they are produced by 

 a cross between sea and river trout. The 

 varieties of the common trout are almost in- 

 finite; from the great lake trout, which 



GREAT LAKE TIIOUT. 





