Amphicarpaa tnonoica. 2X9 



As no support had been given to them, they twined around 

 eacli other. 



On July 1, the main stem of a plant was cut off above 

 the simple leaves. ( hie of the axillary branches was taken 

 away ; the other about ten inches long was left. 



( >n July 15, it was seen that the runner had increased to 

 fifteen inches, and in the axil of each small leaf upon it 

 had appeared a little branch. The main runner did not 

 twine nor exhibit any inclination in that respect. An ac- 

 cessory bud was seen in the axil of the simple leaf. 



In some cases the shoot declined for some distance out 

 of the pot, then twined feebly around some support that 

 was near. It did not take the one provided in its own pot. 

 The results obtained in this series bear a direct relation to 

 the age of the shoot at the time when operations are begun. 

 One may readily see, then, that if the true stem is de- 

 stroyed, its place is taken by the axillary shoot, and that 

 which in its norma I condition possessed pronounced geotropic 

 characteristics, now exhibits apogeotropic ones. Yet, if the 

 injury takes place after the shoot is tolerably long, it is 

 impossible to change its strongly-impressed habits ; its 

 inherited tendency remains. 



Cutting off Main Stem above First Compound 



Leaf. 



On June 6, the main stem of quite a tall vigorous plant 

 was cut off above the first compound leaf. Axillary 

 branches were removed from the simple leaves. A single 

 bud remained in the axil of the compound leaf. 



On June 29, the branch which had developed in the axil 

 of the compound leaf was vigorously twining. The plant 

 was about two feet high. Axillary runners from simple 

 leaves were ten inches in length. 



On July 8, the plant was two and a half feet in height ; 

 the axillary runners, eighteen inches. 



