246 



POMOLOGY 



quires a long growing season witli a high summer tempera- 

 ture. SHght departures from these requirements are at 

 once manifest in a smaller size and poorer color. 



Figures for these more conspicuous examples are quoted: 



Table LXXV 



LENGTH OF GROWING SEASON FOR YELLOW NEWTOWN, ESOPUS, AND 

 WINESAP APPLES (AFTER WINSLOW) 



PHENOLOGICAL STUDIES 



The student will find a profitable field of study in observ- 

 ing the relation between climate and certain periodic phe- 

 nomena of fruit-trees, such as time of blooming and ripening 

 of fruits. 



214. The physiological constant.^ — There have been a 

 number of attempts to calculate the total amount of heat 

 or temperature necessary for a plant to function and go 



iWaugh, F. A. Vt. Agr. Exp. Sta. 11th Ann. Kept. 1897-98. 

 pp. 263-272. 



I. Lamb, G. N. A calendar of the leafing, flowering, and seeding of 

 the common trees of the Eastern U. S. 



II. Smith, J. Warren. Phenological dates and meterological data 

 recorded by Thomas Mikesell between 1873 and 1912 at Wauseon, 

 Ohio. U. S. Dept. Agr. Weather Bur. Suppl. 2. 1915. 



