386 PROCEEDINGS OF THE ACADEMY OF [1892. 



when the growth wave returns, starting each bud again to develop- 

 ment in this reflex action. As it is the lower and more slender 

 pedicelled flowers which are discoid, nutrition has evidently 

 determined the absence of rays, but whether this point was decided 

 during the upward or the reflex movement of the growth-wave could 

 not be determined, though the former seems the most probable. 



The annexed figure from the dried specimen on the table shows 

 the conical growth of the panicle almost to a rest, and the 

 subsequent resumption of active growth to form the terminal 

 corymb. 



