7Z 



Anne, the period beginning Aug. 4 is the only one v<5howing a 

 difference of considerable magnitude between the relative 

 leaf area values and dry weirht values. 



The property of soy-bean shown by these graphs renders 

 possible the use of the leaf area of the plant as an index of 

 its dry weight. The bearing of this property of soy-bean on 

 its use as a standard plant for climatic investigations has 

 been referred to in a previous paper by the v;riter. 



f 



Hildebrandt, y. I.T. , Leaf-product as an in'lex of growth 

 in soy-bean. Johns !Ioi-i>ins Univ. :;irc. March, 1917, 



The correlation of the plant and climatic values for the 

 four-week periods will be discussed under two heads. The first 

 of these will take up the relation of the four week relative 

 stem height values to sunshine and temperature iridex val^^eB and in 

 the second an attempt v/ill be made to correlate dry weight with 

 the tJiree olim-.tic conditions using the assumptions made in 

 correlating the two week leaf-product values with these con- 

 ditions. The dry v/eight is employed in the consideration of 

 the four-week data ra'-her than the leaf area since it is the 

 most frequently used criterion of growth. Also, as has been 

 noted above, the leaf area and the dry v/eight of the plants in 

 this experiment correspond closely in relative value, ind for 

 such rough comp-.risons as are here made, may be used inter- 

 changeably. 



