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. Imperfect union of a whip-graft. The body of the stock is on the 

 left ; then follows the tongue of the don ; then the tongue of the stock ; 

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

 lack of union which sometimes 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 



