75 



resemblanee in general form betv^een the stem height and tem- 

 perature graphs for Darlington is thus less striking than for 

 the other stations. Tne effect of light intensity on the stem 

 height for Darlington does not show in the graph. For Coleman, 

 the general resemblance in form bet-^;een the stem height and tem- 

 perature graphs is quite close. The light and stem height 

 graphs slope in opposite directions for the interval between 

 the period beginning May 13 and the period beginning June 11 

 and the interval between the period beginning June 24 and the 

 period beginning July 22. The stem height graph for 'Gaston 

 shows a close resemblance in general form to the graph of 

 physiological indices nd is opposite in slope to the sunshine 

 intensity graph from the period beginning May 8 to the period 

 beginning July 20. The stem height graph for ^rincess Anne 

 shows the tjrpical reittioh to the temperatu'-e index values and 

 is opposite in direction of slope to the sunshine graph from 

 the period beginning May 11 to the period beginning June 23 

 and from the period beginning July 21 to the period beginning 

 Aug. 18. 



There are certain obviuus objections which may be nade 

 to the above vie- of the relation betv.'een stem height, tem- 

 perature, and litp-ht. It may be said that the opposite slope 

 of the stem height and sunlight intensity graphs during the 

 first part of the season is pi.rel" accidental. The stem 

 height, being apparently determined in 'he main by tempera- 

 ture values follows the graph of temperature indices, which 

 graph-iuring the first part of the season has a direction of 

 slope opposite, in general, to the direction of slope of the 

 light graph. Attention has been called, however, to a number 



