INHIBITORY EFFECTS OF A SECOND ORDER 



123 



Table XXIV 



One gram dry weight of leaf in fourth node produces 147 miUigrams dry 



weight of apical shoots. 

 One gram dry weight of leaf in second node produces 111 milligrams dry 



weight of apical shoots. 

 One gram dry weight of leaf in apical node produces 83 milligrams dry weight 



of apical shoots. 



Fig. 99.— Half stem with leaf at apex. Nov. 12 to Dec. 5, 1923. 



While the absokite figures would be slightly altered, the main 

 result would remain, that the contribution of a basal leaf to 

 shoot formation at the apex does not diminish with the distance 

 of the leaf from the apex, but rather increases. 



We would assume that these inhibitory effects of a second order 

 are also caused by the descending sap from an apical leaf; but 

 whereas the inhibitory effect in the direct path of the descending 

 sap is almost absolute the inhibitory effect outside the path 

 shows itself only in a delay and in a slight diminution of the shoot 

 formation. 



