390 



TEE AMERICAN NATURALIST [Vol. LV 



TABLE I 



Number of leaves: Average dry weight of leaf 



Dry weight of shoot: Average dry weight of pod 



Total weight of fruit: Average dry weight of pod. 

 Number of oods: Averasre drv weisrht of cods 



.r= + .891 ± .009 



".r=+ .607 ± .023 

 .r= + .301±.033 



!r= + !219 ± .035 



!r==+ [390 ± !031 



correlation between the average weight of the organ 

 studied and the size of the entire plant, however meas- 

 ured. This correlation is in most cases rather small in 

 amount, but in every instance but one the coefficient is 

 more than six times as large as its probable error and 

 may therefore be regarded as significant. The coefficients 

 are least in the case of the seed, somewhat higher for 

 the pod and of considerable magnitude for the leaf, being 

 particularly high in the case of the immature plants. 

 From these figures, therefore, it might reasonably be 

 inferred that there is a significant relation, though a 

 small one, between organ size and size of plant in beans, 



TABLE II 



