57 



height index foi- all pei". except those beginr. ' 

 and Aug. 14. "■ ' ^'lese graphs are not rela-^ively 

 hiigh. ;'l) The grapiis ior JJie-.vg ' , ' onrovia^ Princ ess Anne 

 and Sastcu . liigher raidsumn^r valu ; . lant growth rates 

 than, io the Oakland graphs, the maxima "being about' 1 l/2 times 

 the seasonal average here Gonsiderei as 100. (Z] T :ie grapi.s 

 for Coligge, BaltiiTiore, Darlington, and Ooleman -re peculiar 

 in tha-^ they exhibit high relative values of t'reir maxjm^i. 

 From the present poin"^ ' -le'w then, the ; nterestii-g character- 

 istics of the graphs are summarized ' "^he above classifjc- 

 tion and the statement tftt thev show a seasonal march from. Icr: 

 values in the early part of the season to high mia.sur.".;.ier values 

 Tith a subsequent falling off to low values in the later parts 

 of the season. 



Correlation of plant and climatic da''"a. 



In attempting to Gorrela-f-e the plant and climatic data 

 the graphe representing the plant and climatic m.easurements for 

 all the cultures of the Investigation were inspected to deter- 

 mine -^^hether a general scheme of correlation could be ■'''•:"mu- 

 lated that would explain in any consistent manner the cr-aructer- 

 i sties of the plant behavior in terms of the corresponding cli- 

 matic values. It was fo-;nd po;--.sible t? formi:l?,te such a 

 scheme but sir.ce each of the three climatic conditions measure a 

 acts on the plant in a ni:inber cf ways, the most that could be 

 accomplished wo.s £. ieterminati on of what seemed -'■he ■pre'^on^.ero.t- 

 ' ng influence on the plant of each of *" t'lree envj.roi-r.ei^xa-i- 

 condif ':.ere considered. conclusions reached as to the 

 principal effect of these environmental conditions are given 



