I I 



' I ■ I 



In,. 6. Section through a young graft, greatly magnified. The round mass of 

 scar tissue is merely accidental. 



black cell divides quite independently of the white ones, it produces 

 only black offspring; and, similarly, the white cells dividing produce 

 only white offspring. Conversely stated, each cell is the offspring of 

 one parent only, not of two ; and it will therefore have the qualities 

 of one parent onlv. 



The two kinds of tissue may commingle or lap in together some- 

 what along the line of junction, but this mixture is only mechanical, 

 not physiological. 



The question of the mechanical strength of the graft union may 

 be postponed for a moment until we consider the morphology of the 

 union produced in budding. 



