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 Beddard, F. E., On the Aftershaft in the Feathers of certain Birds. Ibis, 18S5, 

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Bogdauow, At, Note sur le pigment des plumes des oiseaux. Bull. de la Soc. 



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 Butler, A. G., Characters in Birds' Wings. Avicul. Mag. (2) ii, pp. 319-320 (1904). 

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 Chapmau, A. C, On the seasonal changes of Plumage in Birds. Zoo!. 1885, pp. 



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 Clark. H. L.., The Pteiylography of certain American Goatsuckers and Owls, 



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theilung. Morph. Jahrb., xiv (1888), 8. pp. 369-371. 

 Degen, E., On some of the Main Features in the Evolution of the Bird's Wing. 



Bull. Brit. Ornith, Club., ii, 1894. 

 Dwight, J., Plumage wear in its relations to pallid subspecies. Auk, xxn, 1905, 



pp. 34-38. 

 Forbes, W. A., The Claw on the Index-finger of the Cathartidae. Amer. Xatu- 



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 Fürbringer, M., Untersuchungen zur Morphologie und Systematik der Vógel, 



zugleich ein Beitrag zur Anatomie der Stütz-und Bewegungsorgane. 



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 Cíadow, H., On the colour of Feathers as affected by their Structure. Proc. Zool. 



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— Eemarks on the Numbers and on the Phylogenetic Development of the 

 Eemiges of Birds. Proc. Zool. Soc. Lond., 1888, p. 656. 



