144 PROPAGATION. 



the union of the scion with the stock is effected by 

 means of the cambium which exudes from the cut 

 surfaces of the two portions, becoming organized, and 

 producing complete union. " As the graft is merely an 

 extension of the parent plant from which the scion 

 came, and not, properly speaking, a new individual, so 

 it is found to be the best method of propagating ap- 

 proved varieties of fruit trees, without any danger of 

 altering the quality of the fruit. Till lately grafting 

 was confined to the ligneous plants, but it is now suc- 

 cessfully practised on the roots and shoots of herba- 

 ceous vegetables ; and the Dahlia is grafted by the root, 

 the Melon on the Gourd, the Love-apple on the Potatoe, 

 etc., by the shoot." (Loudon.) 



252. Plants may be otherwise propagated, as by 

 means of the bulbs generated in the scales of larger 

 bulbs ; by the latent buds in the tuber, as of a Potatoe ; 

 by the buds occurring sometimes on the leaves, and 

 upon the stem in the axillre of other buds, etc., etc. ; 

 but upon the whole of this subject the practical works 

 of Loudon should be consulted. 



