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skins of all of them, being frequently found 

 in their stomachs. We have found also, several 

 small shells, examples of the Physa and 

 Neritina Jluvialis. Dead shells and small 

 pebbles are also found; but whether these 

 last are taken up by the fish to serve any 

 useful purpose, as in the stomachs of galli- 

 naceous birds, or have only formed part of the 

 case of the Phryganea, may be questioned. 

 Some English authors have considered the 

 grayling a migratory fish, passing the winter 

 in the sea, and the summer in fresh water. 

 " Early in spring," says Mr. Donovan, " they 

 ascend the rivers, where they remain till 

 autumn, . and then return to their former 

 element." This may apply to grayling on 

 some parts of the European continent,* but is 

 not the case certainly with our fish in this 

 country, in the rivers of which it is found in 

 the most perfect condition, and, in consequence, 

 most eagerly sought after in October and 

 November. We have caught grayling in the 

 Dove on the 27th of March this year the 

 very day on the evening of which we are now 

 writing between Norbury and Rocester, and 

 though small ones not exceeding three 

 quarters of a pound in weight some of them 



* Block says the grayling descends to the Baltic in 

 autumn. 



