372 Herrick, Audubon's Bibliography. \ia\\ 



Nineteen females: Wing, 535-565 mm. (548); tail, 134-148 

 (139) ; oilmen, 134.8-148.8 (141.2) ; basal depth of upper mandible, 

 29.6-32.6 (30.7); basal width of upper mandible, 30-33.5 (32); 

 tarsus, 88.3-94.4 (91.6); middle toe and claw, 121.4-131.4 (125.2). 



The differences recorded in the foregoing paragraphs emphasize 

 the necessity of large series in determining the range of variation 

 in the tubinarine species, and the futility of attributing specific 

 value to similar differences on no better evidence than single 

 specimens. 



The future of the dichromatic and structural variations of the 

 Galapagos Albatross is unknown, as is also the future of the island 

 geographic variations of more widely distributed species. It is 

 held, therefore, that any system of classification that attempts to 

 forecast the remote future of such variations is unscientific, and 

 destined to be discarded like the Quinary System that flourished 

 in the time of Swainson. 



AUDUBON'S BIBLIOGRAPHY. 



BY FRANCIS H. HERRICK. 



At the end of the second volume of ' Audubon the Naturalist ' ! 

 published at the close of 1917, I added a bibliography of 240 titles, 

 seleqtive in respect to biography, criticism and miscellany, but as 

 nearly complete as it was then possible for me to make it in other 

 respects. The most important section was evidently that con- 

 taining Audubon's principal works, five or, perhaps we should say, 

 seven in number, namely: (1) 'The Birds of America' (4 vols, of 

 plates only, in folio); (2) 'Ornithological Biography' (5 vols. 

 Svo. of text to No. 1); (3) 'A Synopsis of the Birds of North 

 America' (1 vol.); (4) 'The Birds of America' (7 vols, of revised 

 text and plates of Nos. 1 and 2, in octavo); (5) 'The Vivipar- 



1 'Audubon the Naturalist: A History of his Life and Time.' In 2 vols. New York, 

 1917. 



