INHIBITORY EFFECTS OF A SECOND ORDER 



117 



gested itself that in the latter case some of the material sent out 

 by the leaf was consumed by the stem in the first two internodes, 

 so that less remained available for shoot formation. 



The fact that the shoot formation in the basal part of the stem 

 diminishes the more the greater the distance between the apical 

 leaf and the new shoot is strikingly illustrated by the following 



Fig. 92.— See legend of Fig. 91. 



experiments (Figs. 93 to 96) which were made simultaneously 

 and lasted from Oct. 2 to 23 : In Fig. 93 a stem less than one year 

 old with one apical leaf was split longitudinally and both pieces 

 were suspended in an aquarium with the base of the stems dipping 

 into water. The pieces with an apical leaf formed roots but no 

 shoots, the pieces without apical leaves formed shoots but no 

 roots. (Roots would, however, have developed later.) Six 



