118 



REGENERATION 



Fig. 93. — Stem split longitudinally, one half with a leaf at the apex, the other 

 without leaf. The one with a leaf forms roots but no shoots, the half stem with- 

 out a leaf forms shoots but no roots. Oct. 2 to 23, 1923. 



Fig. 94. — Left: Half stem removed with exception of region near the 

 apical leaf opposite which a shoot is formed. Right: Half stem removed with 

 exception of piece at first node below the leaf. No shoot is formed. Leaf at 

 apex. Oct. 2 to 23, 1923. 



