THE BREEDING OF CHICKENS 



\y.\ 



(growth somewhat and to stimulate comb (lc\clni)ment, 

 though to a less extent tlian the testis. 



It appears from the c\'i(lcnec of Borinti; and Pearl' (■ou])led 

 with that of Morgan,- and Boring and Morgan,' that the 

 presence of the groups of yellow cells fc.iund in the o\aries 

 of domestic hirds (each known as a corpus luteum), may be 



Fk:. 



Till' saiMIr scctiiin of (lie fcmal(/ ^liown in Figure 31 afterjuieces of ovary 

 from auotlicr irnli-vidual had I'oeu rii^'raftcd. The old male-shaped" 

 feathers arc shown at. the left. Chi the rinht are seen the "hen-shaped" 

 feathers whieh grew after the cn-arj' "was intr.idiiccd, the old feathers having 

 been pulled out. lAfter Cole and Lippineott.) 



responsilile for the suppressiojt of male iiluniage in the 

 female. 



It is a matter of common knowledge among poultrymen 

 that Sel)right Bantam males do nt>t ha\c ordinary hackle or 



' American .Tciurnal of Anatomy, \u\. xxiii. No. 1, and .Journal of Experi- 

 mental ZlkV)1oij:,\', \oL XXV, No. I. 



2 Fioeccdin^s of the Rociet,\' of Fxpcrimental Bioloj;y and Medicine 

 \'ol. x\', pp. .3-4. 



^ .Journal of Geueial riiysiologj-, vol. i, No. 1. 



