SUMMARY— VARIATION RESULTS. 



55 



differentiation is such that a progressive change occurs in the charac- 

 ter of the variation constants as one passes from central to peripheral 



10 



1.6 

 1.4 

 I.Z 

 1.0 

 0.8 

 0.6 

 20 



16 

 12 



8 

 4 



0.6 

 0.2 



I 2 



to 0) 



c O 



O (Q 



0) JQ 





i_ in 



u c 

 0--° 



Fig. 10.— Diagram showing changes in the constants for variation in leaf-number 

 in different portions of plant. Series I, II, and III combined » ; 



Series IV, o ; Series V, X- "X. Series VI, »• . 



portions of the plant until tertiary branches are reached. Here the 

 order of events in part changes, and where previously certain of the 



