Mni^itv^itp ol iHaine 



MAINE AGRICULTURAL EXPERIMENT STATION 



BULLETIN No. i68. 



(Papers i'rom the Bioeogicae Laboratory No. 14.) 



DATA ON CERTAIN FACTORS INFLUENCING 

 THE FERTILITY AND HATCHING OF EGGS 



BY 



Sc\,\\ , 1^^ 



<k^ 



iw'- 



RAYMOND PEARL AND FRANK M. SURFACE. 



ORONO, MAINE 



SEPTEMBER, 1909. 



