204 ON GRAFTING. 



Mrs. B. It has been so affirmed, but it may probably 

 be an error, arising from confounding subterraneous 

 branches with roots. 



The second mode of grafting, and which is in most 

 common use, is by scions : a young branch is cut off 

 from one plant, and grafted on another. In whatever 

 manner the section be made in the graft, one of a cor- 

 responding form must be made into the subject, in order 

 that they may fit into each other, and the vessels of the 

 liber come into contact ; the union then takes place in 

 the course of a few days. 



Emily. The mode of grafting by approach bears a 

 considerable analogy to the propagation by layers ; and 

 that by scions, to the propagation by slips or cuttings. 



Mrs. B. True ; and the third class, which is grafting 

 bourgeons or buds, may in some respects be compared to 

 propagation by seed : it consists in transplanting a bud 

 from one plant to another. For this purpose the bud 

 must be separated from the parent-plant, in such a man- 

 ner as to be surrounded by a small disk or shield of bark ; 

 for since the union is effected by the vessels of the bark, 

 it is through its intervention alone that the bud can be 

 grafted. A small piece of the alburnum is sometimes cut 

 off in addition to the bark, but I believe this to be an un- 

 necessary precaution. The bud may be adjusted on any 

 part of the bark of the tree, but it is more sure to succeed, 

 if it be grafted on a spot where another bud had previous- 

 ly existed, in order that the vessels which conducted 

 nourishment into the original bud, may pour it into that 

 which is substituted in its place. In this manner Mr. 

 Tschudy has succeeded in grafting herbaceous plants, 

 the melon, for instance, on the gourd ; and potatoes on 

 tomatas ; but one herb cannot be grafted upon another. 

 This species of grafting is rather novel, it being formerly 

 supposed that herbaceous plants were not susceptible of 

 being grafted. 



The embryos of buds, before they begin to be developed 

 you may recollect, are called eyes ; and the graft may be 

 made either when the eye is said to be sleeping or wak- 



1122. What is the second mode of grafting and how is it described 1 ? 

 1123. What is the third mode 1 ? 1124. How is it done? 1125.- 

 What experiments were made with it by Mr. Tschudy! 



