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Variation of Birds in a State of Nature by Frank Russell, 1892

Variation of Birds in a State of Nature by Frank Russell, 1892, Page 16

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increase in size. The wing and tail as shown by the plotting paper diagrams, vary most in the largest specimens. and exhibit no correlation whatsoever. The variation in culmen is considerable. the line rising slightly. The middle toe varies most in the medium sized specimens, vary little in the smallest. The hind toe is uniformly variable throughout. Length Wing W. of Culmen, L of Cul. Tail Hind Toe Middle Toe
 
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