PERFECT AND IMPERFECT UNIONS. 



89 



would appear that if the union were good at the expira- 

 tion of the first year, it would remain good throughout 

 the life of the plant. In order to test this point, two apple 

 trees were procured, which were fifteen years old and over 



84. Imperfeci union of a wJiip-j^raft. The body of the stock is on the 

 left : ihenfoltows the tongue of the cion : then the >ongue of the stock ; 

 and finally, on the right, the body of the cwn. The spaces show the 

 lack of union which sotnetimes occurs, (x 25.) 



six inches in diameter, which had been grafted at the 

 surface of the ground in the nursery. In the presence of 

 two critical observers, the trunks were split into many 

 pieces, but no mark whatever could be found of the old 



