No. 640] BODY SIZE AND ORGAN SIZE 399 



maining constant regardless of the actual size which is at- 

 tained. The terminal growing point, like the animal 

 embryo, develops as a symmetrical and interrelated whole. 



Although the size of the leaf thus seems to be closely 

 dependent upon that of the growing point, the size of the 

 reprodnctive organs is evidently much less so. We have 



TABLE VI 



Correlation between the Blade Volume (in Cubic Centimeters) of 

 THE Two Leaves at a Node, in Acer Saccharum. and the Cross Sec- 

 tional Area (in Square Millimeters) of the Pith of the Ixterxode 



seen that leaves do not reach their maximum size except 

 in plants with shoots of about forty grams dry weight or 

 more. The maximum pod and seed size, liowcvcr. is at- 

 tained in much smaller plants, usually those in the vicin- 

 ity of sixteen grams. In other words, a reduction in the 

 size of the growing point is felt much more quickly by 

 the leaf than by the fruit. It is only in plants which are 

 really depauperate that the fruit and seed size is reduced 



