STUDIES IN PLANT REGENERATION 215 
pying the whole of the cut surface, was regenerated (Fig. 9, а). Thus 
the seedling. was “ restored ” to its original condition. Sections 
showed that most of the callus fortned had gone directly over into 
the formation of the one root. А few rows of cells on the side, 
Fic. 9. а. Seedling, and 4, older stem cutting of Pinus Laricio. In both a 
single root regenerated from the callus of the cut surface. 
however, which were not so used, showed that another root 
might have been formed therefrom if there had been space for 
its development. In the other two cases, two roots were formed 
from the beginning. Prantl * and Simon f mention instances in 
Regeneration des Vegetationspunktes an 
Prantl, K. с über die 
Арбор танаа. Arbeit. Bot. Inst. Wurzburg 550. I 
t Simon, чә 27227 über die Regeneration der Wurzelspitze. Jahrb. 
wiss, Bot. 40: 
