105 



Conclusions . 



The main resv-lts of this study may be summarizec under the 

 following hesds; (1), the interrelptions of the climatic measure-, 

 ments, (2j the interrelations of the plent measurements, (5j the 

 relations betwec;n the plant and climatic values, and (4) the 

 measuremient of the climatic complexes by soy-bean, considered 

 as a standard plant. 



The principal features of interest in the clim.atic data are 

 the correspondence of the sunshine ena evaporation graphs ana the 

 slight variability of the physiological temperature index as 

 comiparec. to the indices of sunshine and evaporation. ?rom the 

 first of these it mry be concluded that the energy absorbed from 

 the sun's rays by the porous cups plays a large part in the 

 determination of the evaporation rate. ?ror;: the second, it would 

 seem that during any £;iven time interval the air temperature at 

 the various stations here dealt with was less subject to local 

 variation then either the sunshine intensity or the evaporation 

 rate . 



The relations between the plant measurements fall into two 

 divisions. (1) Ihe relation between the elongating tendency of the 

 plants and their tendency to expand their leaves, and (2> the 

 relation between the leaf area and the dry weight. The data here 

 given indicate that the rate of elongation is greater than the 

 rate of leaf expansion when both are small, ana less than the leaf 

 expansion rate when both are large. Dry weight and leaf area are 

 so related in soy-bean that the relative values of these measure- 

 ments are approximately numerically equal. Both of the above con- 

 clusions apply to the plants of the exposed stations. For the 

 coverea stations, the value of stem height is relatively large 



