DO ROOTS FORM PROM THE CALLUS? 235 



nally on the under side, so that the callus looks 

 downwards, is a fallacy. The direction of the 

 roots, as already said (page 228), is determined 



155. Where the new 

 roots start. 



156. Where the new 

 roots start. 



by the nature of the plant, the texture of the 

 soil, and by the water and food supply. The 

 position of the callus does not influence it. 

 As a matter of practice, it is generally inad- 



