A. H. Lees 



57 



In each of the graphs 1-11, which correspond to the numbered cases considered in the 

 text, the numbers in the ordinates indicate leaf vein numbers and the abscissae represent 

 buds. Each graph starts from the basal leaf and proceeds upwards to the apex of the shoot. 

 Where a leaf was missing the fact is indicated by a dotted line. 



