VEGETABLE 

 FORCING 



BY 



RALPH L. WATTS 



DEAN AND DIRECTOR OF THE SCHOOL OF AGRICULTURE AND 

 EXPERIMENT STATION OF THE PENNSYLVANIA STATE COLLEGE 



AND 



AUTHOR OF "VEGETABLE GARDENING," A COMPANION 

 VOLUME TO THIS TREATISE 



ILLUSTRATED 



NEW YORK 



ORANGE JUDD COMPANY 

 1917 



