IN REPLY REFER TO                                                 ADDRESS
ONLY THE 
CHIEF, BUREAU OF BIOLOGICAL SURVEY 
PLbi n    .                    UNITED STATES 
Lincoln, FDEPARTMENT OF THE INTERIOR 
BUREAU OF BIOLOGICAL SURVEY 
WASHINGTON 
April 18,1940 
Professor Aldo Leopold 
424 University Farm Place 
Iadison, Wisc. 
,uear Aldo: 
In reply to your letter of April 11 I may say that the two 
titles "Do Drakes Outnumber Susies?" and "The Sex itatio of
Banded 
Ducks" refer to the same paper which was published only once, 
namely, in American Game, Vol. 21, January-February, 1932, pp. 3-4 
and 16-17. I gave this paper before the A.O.U. at the i)etroit 
meeting on October 20, 1931, and it is listed on the program which 
was published in The Auk, Vol. 49, Page 58, January 1932. 
Its appearance in American Game is, however, its only publi- 
cation. 
It is my belief that the extensive interest in this subject 
that has been manifest in recent years may be traced directly to 
this paper. Incidentally, when I submitted it to American Game 
it carried the title "The Sex Ratio of Banded Ducks" and I believe

you may imagine my amazement when I first saw it in print under 
the title of "Do Drakes Outnumber Susies?". Seth Gordon was then

president of the association and I believe responsible for a good 
part of the editorial work on American Game. 
14ith best regards, I am 
Sincerely yours, 
iF. C.Lincoln,      nharge 
Distribution and Migration of Birds 
Division of Wildlife Aesearch