212 CIRCUMNUTATION OF STEMS. CHAP. IV. 



(19.) Lilium auratum (Fam. Liliacese). The circumnutation 



Fig. 83. 



Lilium auratum: circumnutation of a stem in darkness, traced on a horizontal 

 glass, from 8 A.M. on March 14th to 8.35 A.M. on 16th. But it should 

 be noted that our observations were interrupted between 6 P.M. on the 

 14th and 12.15 P.M. on 15th, and the movements during this interval 

 of 18 h. 15m. ai-e represented by a long broken line. Diagram reduced 

 to half original scale. 



of the stem of a plant 21 inches in height is represented in the 

 above figure (Fig. h3). 



Fig. 48. 



Cyperus alternifolius : circumnutation of stem, illuminated from above, 

 traced on horizontal glass, from 9.45 A.M. March 9th to 9P.M. on 10th. 

 The stem grew so rapidly whilst being observed, that it was not possible 

 to estimate how much its movements were magnified in the tracing. 



(20.) Cyperus aUernifolius (Fam. Cyperacese.) A glass 



