INHIBITORY EFFECTS OF A SECOND ORDER 



119 



half stems without leaves, with a total dry weight of 1.557 grams, 

 produced in all 0.033 gram of shoots during the 3 weeks the 

 experiment lasted, i.e., 20 milligrams dry weight of shoots per 

 gram dry weight of stems. 



In Fig. 94 (to the left) half of the stem below the most apical 

 node (designated 0) was removed. In this case a shoot was 

 formed opposite the leaf. Six stems were used and the dry weight 

 of the regenerated shoots was 234 milligrams. The dry weight of 



Fig. 95.^ — Left: Half stem removed with exception of piece in second node 

 where a shoot is formed. Right: Half stem removed with exception of piece 

 near third node below the leaf. No shoot is formed. Leaf at apex. Oct. 2 to 

 23, 1923. 



the 6 apical leaves was 2.183 grams. If we assume that the shoots 

 were formed exclusively from material furnished by the leaf 

 (which may not be entirely correct), 1 gram of leaf produced 

 107 milligrams of shoots in node 0. 



In Fig. 94 (to the right) the stem was spht in such a way that 

 the stem near the first node below the leaf (designated as 1) 

 remained intact. In this case no regeneration of shoots occurred, 

 as was to be expected from what has been said, the two buds of the 

 node lying in the path of the sap descending from the leaf. 



In Fig. 95 (to the left) the stems were split with the exception 

 of the second node below the leaf (designated as 2), and in this 

 node a shoot grew out. The total dry weight of these shoots was 



