212 CIECUMNUTATION OF STEMS. Chap. IV, 



(19.) Lilium auratum (Fam. Liliaceae). — The circumnutatiou 



Fig. 83. 



..JtS^OM.lti'!^ 



Sp.mil 



sra.m.1^ 



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 1 6th. 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. 15 m. are represented by a long broken line. Diagram reduced 

 to half original scale. 



of the stem of a plant 24 inches in height is represented in the 

 above figure (Pig. 83). 



Fig. 48. 



Ch/perus alteniifoUua: circnmnutation of stem, illuminated from above, 

 traced on horizontal glass, from 9.45 a.m. March 9th to 9 p.m. on 10th 

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

 to estimate how much its movements were magaified in the tracmg. 



(20.) Cyperus alternifolius (Fam. Cyperacese.) — A glass 



