121 



LA XGDOX—DIOOX SPIXULOSCM 



IQ20 



Discussion 



In his description of the girdling habit, Mettenius (io) finds 

 that "in the developmental stage the traces of the youngest leaves 



Fig. 12. — Detail of organization of cortical foliar strands of three-year-old plant: 

 hi, horizontal strand in transverse section; 1st, longitudinal section of vertical lateral 

 trace near point of union with horizontal strand; x, primary sylem; x', secondary 

 xylem; ph, primary phloem; ph 1 , secondary phloem; X i 20. 



lie in the region of the vegetative point, and at fir>L ascend in an 

 almost perpendicular direction, but during further growth assume 



