540 THE AMERICAN NATURALIST [Vol.LT 



had taken place both in the size, shape and color of the 

 new feathers (Fig. 6), which became like those of the 

 ''normal" male. Since the F, birds were heterozygous. 



tlir ar.M.iiipMiixiim iimiM- of the h\nh (Fig. 



( ) and (if a few r.\' tlirir iVatiicr^ (Figs. 8 and D) show 



(i(.(Mlal<'V cvidnicr fr<.tii tlic .^paycd hen makes prob- 

 al)l(' the view that the ovaiv u\' the hni )n-(Mhi('e> >ome in- 

 ternal x'civtion that inhihit- in hci- the t'lill (h'velopmeut 

 of h. 1- pluma-c whi.-h i^ pot.Mitialix th.- ^ainc a> that of 

 lier mah'. Al't.'i' n-moval of th<. (,varv the inhibition is 

 n-niuvcd an.l when th.' hen ni.n.lt^ >hc (h-vch.tx Iwv full 

 ]H>^^ri,;hti.- of p'nniaur. Sin ihaiK in th,- hen iValhen-.l 

 mah-. sunw internal n-m-tinn nmM inhibit th.- .h-vH.-i-- 



