CHAV. IV 



CIECUMNUTATION OF STEMS. 



205 



Its course greatly eigM times and completed three irregular 

 circles or ellipses. It therefore circumnutated rapidly. Some 

 of the lines run at right angles to one another. _ 



Fig. 74. 



R^tbus (hyboid) : circDmnntation of stem, traced on horizontal glass, from 

 4 P.M. March 14th to 8.30 A.M. 16th. Tracing much magnified, re- 

 duced to half of original size. Plant illuminated feebly from above. 



(7.) Ruhus idcEus (hybrid) (Eosacese, Pam. 76). — As vre hap- 



Fig. 75. 



pened to have a young plant, 11 inches 

 in height and growing vigorously, 

 which had been raised from a cross 

 between the raspberry (Rubus idceus) 

 and a North American Eubus, it was 

 observed in the usual manner. During 

 the morning of March 14th the stem 

 almost completed a circle, and then 

 moved far to the right. At 4 p.m. it 

 reversed its course, and now a fresh 

 tracing was begun, which was con- 

 tinued during 40s h., and is given in 

 Fig. 74. We here have well-marked 

 circumnutation. 



(8.) Deutzia gracilis (Saxifragese, 

 Pam. 77). — A shoot on a bush about 

 18 inches in height was observed. The 

 bead changed its course greatly eleven n„..*..-„ „ „v „ 



° ^ J Veufna grnctlK : circumnu- 



times in the . course of 10 h. 30 m. 

 (Pig. 75), and there could be no 

 doubt about the circumnutation of the 

 Btem. 



(9.) Fuchsia (greenhouse vaiv, with 

 large flowers, probably a hybrid) (Ona- 

 grariese, Pam. 100).— A young plant, 

 15 inches in height, was observed during nearly 48 L. 



tation of stem, kept in 

 darkness, traced on hori- 

 zontal glass, from 8.30 

 A.M. to 7 P.M.Maroh 20th. 

 Movement of bead origin- 

 ally magnified about 20 

 times, here reduced to 

 half scale. 



The 



