THE FOOD OF THE PLANT 63 



in an experiment in which two young sycamore trees 

 were used. The figures 29 (a) and 29 (b) are photo- 



FlG. 29 ( 



Fig. 29 (6) 



graphs of the two plants taken on May 14th before the 

 ring of tissue was removed. 



The stems were then ringed a few inches above the 

 earth. 



The ringing of the stem made no difference to the 

 unfolding of the new leaves. A circular swelling 

 formed round the stem immediately above the 

 ringed portion. In the case of b, dormant buds 

 below the ring began to develop. The plants were 



