212 CHARLES A. SHULL 



The accumulation of data under standardized conditions from 

 many widely separated localities representing wide diversities 

 of climate, should make possible the institution of comparative 

 studies of climatic conditions in various sections of the country, 

 and lay the foundations of a more scientific crop ecology. The 

 best way of making comparisons is statistical analysis of the 

 data. During the period since my connection with the Lawrence 



n- 



(0 



K 

 7 ' 

 6 



5 



4- 

 3- 

 X- 



1 



w .. 



T 



-» — - — > i .i t — — . ' ' i i 



Mar 



Af Y\*} J»ne Ja,.j A *<x'' Sep* Oct No" I a l7 



Fig. 1. Graphs showing the relation between the annual marches of evapora- 

 tion in inches per month (E), wind flow in miles per hour (W), and temperature, 

 divided by 10 (T). 



station ceased, I have examined the data collected, and have 

 subjected it to statistical treatment. Correlation tables show- 

 ing the relation between wind flow and evaporation, and between 

 temperature and evaporation are presented. 



The seasonal curve of evaporation for the University of Kan- 

 sas station is fairly normal, low early in the season, reaching a 

 maximum in July or August, and falling off during the autumn 

 months. The curve of average monthly temperature follows a 



