ON GRAFTING. 199 



on plants of the same family. To ensure the success of 

 a graft, it is necessary that the vessels of the liber of the 

 two plants should meet and correspond, in order that 

 the cambium should descend from the graft into the stock ; 

 for it is by the union of the vessels of the bark of both 

 plants that they are soldered, as it were, together. 



Caroline. Then endogenous plants, since they have 

 no bark, cannot be grafted ? 



Mrs. B. No ; at least that operation has not hitherto 

 been performed upon them with success. 



Some anatomical analogy is also requisite in the form, 

 the structure, and dimensions of the vessels, which is on- 

 ly to be met with, in plants of the same family. A cer- 

 tain degree of physiological similarity is besides necessa- 

 ry ; such for instance, as that the sap in both plants should 

 rise at the same period. There must also be a corres- 

 pondence in the size and strength of the plants ; for in- 

 stance, the lilac may be grafted on the ash ; but, as the 

 latter has a much greater power of suction, the graft is, 

 gorged by the quantity of sap which is thrown up into it, 

 and dies of plethora. If, on the contrary, the ash be 

 grafted on the lilac, the graft perishes for want of nour- 

 ishment. 



A plant which loses its leaves in winter cannot be 

 grafted (at least not without great difficulty) on an ever- 

 green : the latter, absorbing a small quantity of sap dur- 

 ing the winter, would send it up into the graft, which 

 would sprout, in a season in which the young shoots 

 would be destroyed by the frost. 



Caroline. And if, on the other hand, you were to 

 graft the evergreen on a plant which loses its leaves, the 

 graft would perish of famine, 



Mrs. B. Very true ; the last analogy required in 

 grafting is, that the two plants should thrive in the same 

 temperature. 



When a tree is grafted, the graft will always bear its 

 own fruit, and the tree its own also. 



Emily. I am surprised at that. Suppose that a branch 

 of cherry were to be grafted on a plumb-tree ; the sap ab- 



1093. To ensure the success of a graft what is necessary 1 ? 1094. 

 What anatomical analogy and what physiological similarity should be re- 

 garded! 1095. Of grafting the ash and the lilac, what is said? 

 1096. Of a plant which loses its leaves in winter and the evergreen what 

 is said! 1097, What is the best analogy required in grafting! 



