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FURBRINGER, M. 
1888. Untersuchungen zur Morphologie und Systematik der Vogel, zu- 
gleich ein Beitrag zur Anatomie der Sttitz- und Bewegungsor- 
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Gapow, HANS. 
1882. On the color of feathers as affected by their structure. Proc. 
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1888. Remarks on numbers and phylogenetic development of remiges 
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1911. Isotely and coral snakes. Zool. Jahrb., Abth. fiir Syst., 31, 1-24, 
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HAECKER, V. 
1890. Ueber die Farbe der Végelfedern. Arch. f. mikr, Anat., 35, 68-87, 
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HEADLEY, F. W. 
1895. The structure and life of birds. (London, Macmillan), xx + 414, 
78 figs. in text. 
1912. The flight of birds. (London, Witherby), x + 163, 16 pls., 27 figs. 
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Hornabay, W. J. 
1913. Our vanishing wild life, its extermination and preservation. (New 
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JEFFRIES, J. A. 
1883. The epidermal system of birds. Proc. Bost. Soc. Nat. Hist., 22, 
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JONES, L. 
1907. The development of nestling feathers. Bull. Oberlin Coll., 13, 
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KEE, R. 
1886. Bau und Entwickelung der Feder. Zeitsch. f. Naturw., 19, 174-327. 
Know.ton, F. H. 
1909. Birds of the world, edited by Robert Ridgway. (New York, Holt), 
xiii + 873, 16 pls., 233 figs. in text. 
KRUKENBERG, C. F. W. 
1881-82. Die Farbstoffe der Federn. Vergl. Physiol. Studien (Heidel- 
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Matuocr, A. 
1911. Note on the iridescent colors of birds and insects. Rep. Smithson. 
Inst., 1911, 425-432, pls. 1-3. 
Mascua, E. 
1904. Ueber die Schwungfedern. Zeitsch. f. wiss. Zool., 77, 606-651, 
pls. 29-31, 9 figs. in text. 
1905. The structure of wing feathers. Smithson. Mise. coll., 48, 1-30, 
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Newton, A. 
1899. A dictionary of birds. (London, Black), xii + 1088, many figs. 
in text. 
