/ JACQUES LOEB 715 



5. These apical air roots grow out in a few days, while the roots 

 at the basal end of the stem (which in our experiments dip into water) 

 grow out about a week later. As soon as the basal roots grow out 

 in water they cause the air roots in the more apical region of the stem 

 to dry out and to disappear. 



6. In addition to the basal roots, basal nodes have also an inhibit- 

 ory effect on the growth of the dormant root buds in the apical region 

 of a stem. This is indicated by the fact that a stem with one pair of 

 leaves near the base will form apical air roots more readily when no 

 node is situated on the stem basally from the leaf than if there is a node 

 basally from the leaf. 



