R. Haig Thomas 273 



Fenude parent to female offspring. 



Pritti'rn-transfi;n-iico. F^. RreveK x Fonnosaii % "Y" (Iftll nialc- 



assuniing). 

 Interscapulars: Anterior feathers pattern of male lleeves posterior 

 interscapulars, /raia^e parent to male offspring. 



Pattern-transfcren('(>. F^. Reove.s x Fonnosan ^. 



Tail: Outer vane of lateral rectrix pattern of leniale Reeves 



priTtiary. 

 This examination of the plumage of the F, sterile hybrids reveals 

 several intei-esting points. 



1. The number of female characters of their species transmitted 

 by the male parents to their female offspring is quite considerable, and 

 the number of male characters of her species transmitted by the female 

 parent to her male offspring is fewer. 



2. There are quite an appreciable number of cases of colour and 

 pattern-transference, and three of the colour-transferences were trans- 

 mitted by the male parent to the male offspring and are of the nature 

 of secondary sexual characters. 



3. That in both crosses Reeves x Formosan and Reeves x Versicolor 

 the structure of the posterior back feathers and tail coverts of the 

 males, degenerate in both male parents, has been transmitted normal, 

 like the male of her species to her male offspring by the female parent. 



A fourth very remarkable point is the difference between the 

 1910 plumage of F^ Reeves x Formosan % " Y," and that of 1911. Much 

 of the 1910 plumage was transmitted by the male parent, many areas 

 being that of the female of his species, whilst the male-assuming 

 plumage of 1911 was, in every area on which it occurred, the male 

 plumage of the female parent species ; showing that to this one sterile 

 individual both parents had transmitted characters of the opposite sex 

 of their species absolutely pure to type. 



APPENDIX B. 



Fertile Hybrids. 



Mutating conditio)! of four areas from unpatterned to patterned : 



[Throat, Breast, Flank, Thigh-tuft, 



in the males of F, "BA," F, " BBA," F, "BBBA" and F, "BBBA " 

 inter se Silver x Swinhoe (Series 1), Fertile Hybrids.] 



Journ. of Gen. v 18 



