CHLOROPHYLL AND GROWTH 



Fig. 15. — Arisrema tri- 

 phyllum grown in darkness. 



the bud. They soon 

 became recurved at 

 ' the margins, and only a 

 small increase in size oc- 

 curred after unfolding. 



The removal of one 

 leaf and the scape, from 

 plants grown in an air 

 free from carbon dioxide, 

 resulted in a somewhat 

 more complete develop- 

 ment of the laminae than 

 in an entire plant under 

 the same circumstances. 

 The angles taken on in 

 the bud completely dis- 

 appeared, an approxi- 

 mately normal green col- 

 or, and a position quite 



