R. H. Thomas 293 



Fi. $,"(?." TJiigli: Posterior and Anterior, pattern of very marked 



scratchiiigs of dark silver grey on pale cream gi'ound. 



Size of feathers very smalk 



Tile gradual degeneration in tlie dimension of the feathers in the 



thigh area (Phxte XXVI) is a marked and distinct feature of the series 



which reaches the point in Ft "K," of degeneration of the barbs. In 



this area of their plumage the F^ $ ^ (F^, inter se) show the same 



individual Mendelian segregation as in the breast and flank (Plate 



XXIV). This dwindling in size associated with change of form was also 



observed in the breast and flank of some -fa $ ? and all the -f 4 ? ? 



(Plate XXIV). 



APPENDIX B. 



Investigatiux into Origix of Hybrid Coxditiox. 



TAIL. ( Plate XXIII.) 



Central putter n Lateral pattern 



F,. "BA," ^^Jlybrkl. Silver (/, 8 month.?, Swinhoe ?, central. 



lateral. Plate XXIII, fig. 2. 



Culoiir Colour 



Swinhoe $ , central. Silver $ , lateral. 

 vSilver ? , lateral. Swinhoe $ , lateral. 



F,, F„ F„ all hybrid. Plate XXIII, figs. 5, 6, 7. 



^3 $ mutation "P." 2nd lateral exact shade of delicate grey found 

 on Silver J' transition jjlumage anterior scapulars. Plate XXIII, fig. 7 

 and Plate XXII, fig. 6. 



BREAST AND FLANK. (Plate XXIV.) 



Second examination alongside of 8 month immature plumage of 

 Silver J'. 



Patterns 



F,. " BBB A" inter se,"C" %, Hybrid. «. Silver $, "£." Plate XXIV, 



fig. Ic. 

 b. Silver J', 8 month. Plate 

 XXIV, fig. Sb. 

 Breast. Plate XXIV, fig. 10((. 



Flank. „ „ b. 



Colour 



Fig. 10 «, b. Swinhoe $ and 

 „ Silver </, 8 month, 



Journ. of Gen. in 30 



