CHAP. IV. 



CIRCUMNUTATION OF STEMS. 



205 



its course greatly eight times and completed three irregular 

 circles or ellipses. It therefore circumnutated rapidly. Somr 

 of the lines run at right angles to one another. 



Fig. 74. 



Rubus (hyboid) : circumuutation 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.) Rubus idceus (hybrid) (Kosacese, Fam. 76). As we hap- 

 pened to have a young plant, 11 inches F - 75 

 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 40 h., and is given in 

 Fig. 74. We here have well-marked 

 circumnutation. 



(8.) Deutzia gracilis (Saxifrageze, 

 Fam. 77). A shoot on a bush about 

 18 inches in height was observed. The 

 bead changed its course greatly eleven j) eutzi 

 times in the course of 10 h. 30 m. 

 (Fig. 75), and there could be no 

 doubt about the circumnutation of the 

 stem. 



(9.) Fuchsia (greenhouse van, with 

 large flowers, probably a hybrid) (Ona- 

 grariese, Fam. 100). A young plant, 

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



zia grooms : circumnu- 

 tation of stem, kept in 

 darkness, traced on hori- 

 zontal glass, from 8.30 

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

 Movement of bead origin- 

 ally magnified about 20 

 times, here reduced to 

 half scale. 



The 



