On the influence of wonnd stimnli on the 



formation of adventitious bnds in tlie 



leaves of Gnetum Gnemon L. 



by 

 JAN VAN BEUSEKOM. 



It had been observed for a long time already that ad- 

 ventitious sprouts were formed on the leaves of a spéci- 

 men of Gnetum Gnemon L., cultivated in the Botanic 

 Garden at Utrecht. 



In January 1906 my attention was drawn to this cir- 

 cumstance by Prof. Went, who advised me to study the 

 development of thèse adventitious sprouts and to try to 

 discover the origin of their formation. 



The results of this investigation will be concisely com- 

 municated hère. 



The adventitious buds appeared on the tip of the leaves, 

 while thèse were still attached to the plant. 



As far as I hâve been able to find out, the formation 

 of thèse adventitious buds lias never before been observed 

 with Gnetum Gnemon, neither in its natural sites, nor in 

 botanic gardens ') except at Utrecht. The Utrecht Garden 



1) On this point I gained information from tlie other botanic gar- 

 dens in our country, from that at Munich and also from that at 

 Bultenzorg. 



