ik; iliiH'tl sunlight \v;is jiiliiiillfd. 'I'rci-s ucrr cul down in the 

 iniiiK'diate ncijilihorliood oi" tlu' plant, so that the sun would 

 shine upon it Itt'twccn 11 in the niorniiif; and 4 in the after- 

 noon. 'Ill ' pbint li;id youii*; leaves whicli had not reached their 

 full size aiul which were further distiiifruished hy their li<rht 

 green color. It also had Tuature leaves of a dark green color. 

 It was found that the younger leaves were, en the whole, more 

 quickly responsive than the older ones. 



The plant was snudl enough to be easily covered with a soap 

 box. When covered in the evening, the plant showed a ".sleep" 

 position when the box was removed at any time during the day. 

 This position in Erythriua is not as pronounced as in Phaseolus, 

 Desmodium or Oxalis. The leatlets have a downw-ard trend, but 

 do not ajjproach so nearly the vt^'tical position. 



FiGUUE 1. — Krylliiiiiii hcrbacHu willi leaves m dn- .so-oalU-d "slet-p" po.sition. 



