MODES AND PRINCIPLES OF PROPAGATION. 47 



ing does not break the shoot and the cell injury starts the 

 process of healing sooner than by slitting. 



Fie. 17. Layered branch split to favor root formation. 

 (After Goff.) 



FIG. 18. Summer layering of shrubs. (After Bailey.) 



Summer layered shoots of a shrub are shown in Fig. 18. 

 The figure does not show the pegging down. If not 



