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THE AMERICAN NA TURALIST. 
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Fic. 2. 
If it is proposed to test the result of re-stocking a locality in 
lation, those having a larger number of dorsal fin-rays tending 
towards the possession of a larger number of anal fin-rays. 
necessary to first determine the “curve of distribution ” from 
which a species of fish has become reduced in numbers, it is 
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fish native to the locality, and this curve may be based on any 
measurable structural character, such as the number of fin-rays, 
must then determine the “curve of distribution,” for the same 
structural character, of fishes of the same species, but abun- 
. ” 
dantly found at another locality, from which the “brood fish 
the number of scale-rows, or the number of vertebræ. 
