By Thomas Andrew Knight, Esq. 257 



was then scraped with a knife, to prevent the reproduction 

 of the bark, and the layers were recommitted to the soil ; 

 and at the end of a month I had the pleasure to observe that 

 roots had been abudantly emitted by every one. In other 

 instances, I obtained the same results, by simply scraping off 

 at the same season, a portion of the bark, immediately at 

 the base of the tongue of the layers, without taking them 

 out of the ground. 



By the preceding mode of management, the ascending 

 fluid is permitted to pass freely into the layer to promote its 

 growth, and to return till the period arrives at which layers 

 generally begin to emit roots : the return of the sap through 

 the bark is then interrupted, and roots are, in consequence, 

 emitted ; and I entertain little doubt that good plants of 

 trees, of almost every species, may be thus obtained at the 

 end of a single season. I wish it, however, to be understood, 

 that my experiments have been confined to comparatively 

 few species of trees ; and that I am not much in the habit of 

 cultivating trees of difficult propagation. 



