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plant, would promote and accelerate the disease. 

 These, reduced in number and size, do not properly 

 elaborate the sap ; and we have always found that, 

 under such circumstances, these stunted organs exhale 

 the aqueous particles of the sap very abundantly, 

 whilst their power of absorption is greatly reduced. 

 The sap, thus deficient in quantity, and increased in 

 acridity, seems to corrode, and affect the vascular 

 system of the tree in the manner already described. 



These facts afford us most important guides in at- 

 taining the desired objects, the prevention and cure of 

 the disease. 



If superluxuriance threaten its introduction, the 

 best remedy is for the cultivator to remove one of the 

 main roots of the tree, and to be particularly careful 

 not to add any fertile addition to the soil within their 

 range. On the contrary, it will be well, if the con- 

 tinued exuberant growth shews its necessity, for the 

 staple of the soil to be reduced in fertility by the ad- 

 mixture of one less fertile, or even of drift sand. 



If there be an excess of branches, the saw and the 

 pruning knife must be gradually applied. It must be 

 only trees of very weak vital powers, such as is the 

 Golden Pippin, that will bear the general cutting of 

 the annual shoots, as pursued by Mr. Williams. A 

 new vigorous variety would exhaust itself, the follow- 

 ing year, in the production of fresh wood. Nothing 

 beyond a general rule for the pruning can be laid 



