10 



INHERITANCE, FERTILITY, AND SEX IN PIGEONS. 



Some breeding behavior which is quite as instructive as that secured from crosses 

 ha> been obtained from the simple breeding (i.e., without crossing), and from the 

 inbreeding, of individuals of the same species or race. This is true for both wild 

 species and domestic breeds or races of pigeons. Among the latter are the pouters, 

 homers, and barbs. The zenaidas, ground-doves, Oriental or Japanese turtles, 

 and guinea-pigeons are the wild species of most importance in this respect. 



In this type of mating some of the effects of age and season on germs and 

 offspring are displayed free from the complications added by hybridization, while, 

 on the other hand, t he results thus obtained prove most helpful in the understanding 

 of similar phenomena obtained in the crosses. (EDITOR.) 



The following primary crosses (not including crosses of varieties of domestic 

 pigeons) have been made: 



Ijisl of cnnmr.1. 



\\ hitman HM. ,1 x here in a summary (A 1/7); the editor has the original data for only 6. 



limentaiy, 



' Th<- record . "one acted Jls a female, but was killed by Dr. Guyer and found to be a male." 



iii'ii, the niiyr. X alba cross. EDITOR. 



ined (1911 and 1915) by the editor with the birds of the Whitman collection. 



"I'll.- ITO-WS marked iil, an asterisk (*) have been added from the records, by the editor, to an early summary (A 1/7) 

 : \\ hitman. 



