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The following list includes principally such titles as have been consulted 



in the preparation of this paper, but certain works have been included 



which have a bearing on the subject, but were not available for reference. 



ALLEN, GRANT. Physiological Esthetics. 



ALLEN, HARRISON. The Distribution of the Color-marks of the Mammalia. 

 Proc. Acad. Nat. Sci. Phil., 1888, p. 84. 



ALLEN, J. A. On the Mammals and Winter Birds of East Florida, with 

 an Examination of certain assumed Specific Characters in Birds, 

 and a Sketch of the Bird-Faunae of Eastern North America. Bull. 

 Mus. Comp. Zool., ii, 1871, pp. 161-450. 



On Geographical Variation in North American Birds. Boston 



Soc. Proc., xv, 1872, pp. 15, 212, 219. 



Laws of Geographical Variation in North American Mammals and 



Birds. Am. Nat., viii, 1874, pp. 227-229. 



The Influence of Physical Conditions in the Genesis of Species. 



Kadical Keview, i, May, 1877, pp. 108-140. 



The North American Species of the Genus Colaptes, considered 



with Special Reference to the Relationships of G. auratus and C. 



cafer. Bull. Am. Mus. Nat. Hist., iv, pp. 21-44. 



ARGYLL, DUKE OF. Acquired Characters and Congenital Variation. Na- 

 ture, xli, pp. 173-174, 294-295, 366-367. 

 Organic Evolution, Nature, xxxiv, pp. 335-336. 



BAIRD, BREWER & RIDGWAY. A History of North American Birds. Land 

 Birds. 



BAIRD, S. F. The Distribution and Migration of North American Birds. 

 Am. Journ. Sci. and Arts, xli, 1866, pp. 78, 184, 337. 



BALL, W. P. Are the Effects of Use and Disuse Inherited? 



BECCABJ, O., and MORSELLI, E. L'eredita conservativa e la trasmissione 

 dei caratteri acquisiti nella teoria della evoluzione organica. Riv. 

 Filos. Sci., x, pp. 47-53. 



BEDDARD, FRANK E. Animal Colouration. An account of the Principal 

 Facts and Theories Relating to the Colours and Markings of Ani- 

 mals. 



BLYTHE, EDWARD. On the Reconciliation of certain apparent Discrepan- 

 cies observable in the mode in which the seasonable and progres- 

 sive Changes of Colour are effected in the Fur of Mammalians 

 and Feathers of Birds; with various Observations on Moulting. 

 Charlesw. Mag. Nat. Hist., i, 1837, 259-263; 300-311. 

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