■• • ■' - '■■' ' ■'■ ' ■ ' ■ ' ■' ■ M . M . ' . l.'.l.'.I.M.M.M.M.'.l.i.l.M.l.l.M.l.l.M.F.l.l.l.l.i.i.i.i.i., ■ ■■ i ll,, ..ill i , .,. 



THE INFLUENCE OF YEAST 



UPON FERTILITY AND 



HATCHABILITY OF 



HENS' EGGS 



y 



BY 



harry r." Lewis 



Former Professor of Poultry Husbandry, New Jersey Agricultural 



Experiment Station and Author of Standard Text Books 



on Poultry Science. 



ISSUED BY 



THE FLEISCHMANN COMPANY 



701 Washington Street 

 NEW YORK CITY, N. Y. 



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