1910.] 



PUBLIC DOCUMENT — No. 31. 



213 



varies with the locality. It is lower in the north than in the 

 south. 



7. The cause of the variation in quality is chiefly the varyino- 

 amount of heat prevalent during the growing season. 



8. In order to develop satisfactorily in quality the Ben Davis 

 should have an average monthly mean temperature of not 

 less than 60° F. for the growing season, March to September, 

 inclusive. 



