42 



12. Hatching power gives evidence of being transmitted from sire to daughter. 



13. Insufficient data are available on the transmission of hatching power from 

 sire to son. 



14. Fertilit.y is evidently not an inherited characteristic. 



15. Hatchability is evidently an inherited trait. High hatchability is dependent 

 in inheritance upon one dominant gene. Both male and female parent govern the 

 hatching record, thus obscuring the true genetic composition of either parent. 



16. Genetically pure hens for high hatchability may be discovered through their 

 own hatching record. Genetically pure males for high hatchability can be dis- 

 tinguished from males heterozygous for the factor only bj^ the progeny test com- 

 bined with mating tests. Both the mating and the progeny test should be used 

 for choosing males to improve the flock in hatchabilitj\ 



REFERENCES. 



1. Atwood, H., West Virginia Experiment Station Bulletin 124, 1909. 



2. Dunn, L. C., Address before the Annual Meeting of Instructors and Investi- 



gators in Poultry Husbandry, 1923. 



3. Lamson, G. H. and Card, L. E., Connecticut (Storrs) Experiment Station Bul- 



letin 105, 1920. 



4. Pearl, Raymond, Maine Experiment Station Bulletin 168, 1909. 



5. Pearson, K., On the Laws of Inheritance in Man. I. Inheritance of Physical 



Characters V. II, 1903. 



