200 



EXPERIMENT STATION. 



[Jan. 



This has led to a study of the diti'ereiices in the climatic 

 conditions in the ditferent years. The apple during its early 

 stages of growth, following blossoming, is relatively more elon- 

 gated than is the mature fruit. During the later periods of 

 growth it enlarges in cross diameter relatively more. A study 

 of the temperature during the latter part of the summer failed 

 to show any differences corresponding to the variations in form. 

 An examination of the daily mean temperatures for a period 

 at and following the blossoming period gave more positive re- 



riAY 



^ 5 7 9 W \3 \S \7 \9 21 23 25 27 29 3\ 



Fig. 1. 



suits. At Amherst the apples measured in the last four years 

 have been successively more and more elongated. The temper- 

 atures during the blossoming season for the last three years are 

 shown in Fig. 1. The date of full bloom and index of form 

 are also shown. We do not know the date of full bloom in 

 1907. An examination of this chart shows that the tempera- 

 ture for a period of two or three weeks following blossoming 

 has been lower each year, in agreement with the greater elonga- 

 tion of the fruit. 



We have data for a number of other stations, and all show a 

 similar correspondence of temperature and form. Fig. 2 shows 



