CHAP. X. 



APOGEOTROPISM. 



495 



and on the following day. During the second night it fell 



a little, and circumnutated 



during the following day; but it 



also moved a short distance to 



the right, which was caused by 



a little light having been ac- 

 cidentally admitted on this side. 



The stem was now inclined 



60 above the horizon, and had 



therefore risen 70. With time 



allowed it would probably have 



become upright, and no doubt 



would have continued circum- 



nutating. The sole remarkable 



feature in the figure here given 



is the straightness of the course 



pursued. The stem, however, 



did not move upwards at an 



equable rate, and it sometimes 



stood almost or quite still. 



Such periods probably represent 

 attempts to circumnutate in a 

 direction opposite to apogees 

 tropism. 

 The herbaceous stem of a 



Verbena melindres (?) laid hori- 

 zontally, rose in 7 h. so much 

 that dt could no longer be 

 observed on the vertical glass 

 which stood in front of the plant. 

 The long line which was traced 

 was almost absolutely straight. 

 After the 7 h. it still continued 

 to rise, but now circumnutated 

 slightly. On the following day 



it stood upright, and circum- 

 nutated regularly, as shown in 

 Fig. 82, given in the fourth 

 chapter. The stems of several 

 other plants which were highly 

 sensitive to apogeotropism rose 

 up in almost straight lines, and 

 22 



ment of stem from 10 beneath to 

 60 above horizon, traced on ver- 

 tical glass, from 8.30 A.M. March 

 12th to 10.30 P.M. 13th. The sub- 

 sequent circumnutating movement 

 is likewise shown up to 6.45 A.M. 

 on the 15th. Nocturnal course 

 represented, as usual, by a broken 

 line. Movement not greatly mag- 

 nified, and tracing reduced to two- 

 thirds of original scale. 



