30 ALICE M. BORING AND RAYMOND PEARL 
Pott, H. 1909 Zur Lehre von den sekundiiren sexual Charakteren. Sitzber. 
der Ges. Nat. Freund 6, Jahrgang ’09, p. 331. 
SELIGMANN AND SHatTrock 1914 Relation between seasonal assumption of 
eclipse plumage in the mallard and function of testicle. Proc. 
Zool. Soec., London. 
SHATTOCK AND SELIGMANN 1906 An example of true hermaphroditism in do- 
mestic fowl, with remarks on the phenomenon of allopterotism. 
Trans. Path. Soc. London, vol. 57, Pt. I, p. 69. 
SmitH, G. anp Mrs. Hara Tuomas 1913 On sterile and hybrid pheasants. 
Jour. Gen., vole 3; p: 39: 
Smitu, Hammonp 1911 The Field, p. 3 4. 
PLATE 1 
EXPLANATION OF FIGURES 
Holland bird 1429. 
Holland bird 1428. 
Holland bird 1427. 
Holland bird 1426. 
Hermaphrodite 1349. 
Michigan hermaphrodite 1616. 
ao rwh Fe 
