TWO CROSSES BETWEEN DIFFERENT RACES OF PIGEONS. 2IQ 



significant the absence of rever-ed feathers may appear. The 

 iJiite top of the head and the creast appear to be dominant; 

 while the ichitc winy bars are recessive. 



5I( >NS. 



A- -tated ,il.o\r the immlitTol' individual- reared i- too -mall 

 to \\.in-ant Ctensivi /ation-. hill il i- apparent 



that uhile . erlain clia: evidence of mono-hybrid in- 



h. Titan. .-. three characters d. not fnrni-h as ^.'od evidence. 



'llu-c three charactei 'he nninl'ei ..t tail hMther> in the 



i.iil. the (ol.-i | .ittein .'I tl . -\\allo\\. and the re\er-ed lnvaM- 



feathera < !' the tnrl.it. It i- prol) v il.li- that cat h of tlu-e char- 



acters has nol been formi ' i a -in-l<- -tep. l.nt l.\ .1 s< rie- of 



-tep-. 1 It tin- ! HOWS thai tin' condition- pre-ent 



ill the tu< ii\el\ ran not I >e fe| n'e-nited l.\ a pair of 



M. ndeli.m chara. ters. 1 here are then t \\ < iiit.TpnMat ioii-: first, 

 it the characters Mendi-li/e there mn-t In- more than t\\o factors 

 in\ol\ed; -e. ond the ih. - in (jiM-tioii ma\' come under 



-.-nil- other kind of inherit. inn- in \\hirh Miupli- Mi-ndeliai: 



ion do,-- not occur, or p, il.lv the re-nlt- may lie partlx Men- 



delian, parlK not. A large nnml.erof !", otl-prin- will I .e neces- 



-ar\ In tore the-e point- ran l>e -ettled, l.nt enough IKI- been 



loimd, I think, to -h\\ at lea-t in cases like the-e when a t \ pe 



t ^, in, T. H ' atal ZoOlogy," page 171. New York. 1907- 



