44 



REGENERATION 



(Fig. 36). The stems in Figs. 35 and 36 were all cut out at the 

 same time and suspended simultaneously in moist air in the same 

 aquarium. 



In air 



u 



Fig. 36. — Stem cut into 9 small pieces with one node each. Suspended in 

 same aquarium and simultaneously with large stems in Fig. 35. (1) was the 

 most apical, (9) the most basal piece, the serial number denoting the original 

 position of the pieces in the plant. Each piece of stem forms two shoots in its 

 node, but the relative mass of the shoot.s varies with the relative mass of the 

 stem, not with the serial number of the node. 



Fig. 37. — Same experiments as Fig. 35, only that the long piece of stem each 

 was put with its base in water. Duration of experiment from Sept. 27 to Oct. 22. 

 All stems were cut from one plant. Rate of regeneration in proportion to the 

 mass of each piece. 



The results remain about the same when the basal ends of the 

 pieces are dipped into water, the only difference being that often 



