OF PROPAGATION BY GRAFTING. 233 



mer, though it be inserted before the usual period, 

 and in the season when the sap of the stock is most 

 abundant. I have, in different years, removed some 

 hundred buds of the Peach tree from the forcing- 

 house to luxuriant shoots upon the open wall ; and I 

 have never seen an instance in which any of such 

 buds have broken and vegetated during the summer 

 and autumn ; but when I have had occasion to 

 reverse this process and to insert immature buds from 

 the open wall into the branches of trees growing in a 

 Peach-house, many of these, and in some seasons all, 

 have broken soon after being inserted, though at the 

 period of their insertion the trees in the Peach-house 

 had nearly ceased to grow." (Sort. Trans., iii. 136.) 



This property was turned to practical account by 

 Mr. Knight in budding the Walnut. Owing to the 

 excitability of its buds, this tree is difficult to work, 

 because its buds exhaust all their organisable and ali- 

 mentary matter before any adhesion can be formed 

 between themselves and the stock ; but by taking the 

 small, fully matured, and little developed buds, found 

 at the base of the annual shoots of this plant, time is 

 given for an adhesion between them and the albur- 

 num before they push forth, and then they take freely 

 enough. (See Hort. Trans., iii. 135.) 



Buds should either be inserted when the vegeta- 

 tion of a plant is languid, or growth above the place 

 of insertion should be arrested by pinching the ter- 

 minal bud; otherwise the sap, which should be 

 directed into the bud, in order to assist in its adhe- 

 sion, is conveyed to other places, and the bud 



