BARK BUDDING 71 



two operations should be done as close together as pos- 

 sible. Most of the thick-barked trees contain some organic 

 acid in their bark which will oxidize on exposure to the 

 air. Where too long a time elapses between the cutting 



FIG. 35. A Bud which Has Set and the Tie Removed. 



of the patch and the insertion of the bud the exposure to the 

 air tends to inhibit the callusing of the union. It is 

 also important that the fingers should not come in con- 

 tact with the delicate cambium. A little oil or dirt from 

 the fingers will prevent the buds from setting. At the 

 very best the process is slow and expensive and only very 



