38 



self. The bark, losing its health along with 

 that of the tree, becomes tougher, which 

 makes the stricture still stronger. 



It may perhaps be thought necessary I 

 should inform at what age, that,.y4 the ear- 

 liest period, the trees should be peeled. It 

 is difficult to fix a particular date for differ- 

 ent species, varieties," soils, and situations; 

 some species and varieties growing faster 

 than others, and all growing faster or slower, 

 according to the soil and situation. It must 

 therefore be regulated by the symptoms of 

 constriction before mentioned, or as soon as 

 the bark will admit of division. As the tree 

 advances in age, the bark thickens and har- 

 dens ; the peeling therefore must be carried 

 further up every year. 



The practice of grafting shews that a 



