GEAFTING CACTI. 



317 



to insert the scion upside down, especially if worked upon the main 

 stem ; in which case I remove a small piece of the bark from the stock, 

 and fit a thin piece of the desired kind upon it. If this is bound up so 



Fig. XLIX. 



as to prevent air from entering between the parts, it wiU take quite as 

 well as if grafted in the usual way. Where this operation is performed 

 upon spurs, the latter should be trained downwards previously to 



