210 CIBCUMNUTATION OF STEMS. CHAP. IV. 



31 h. 40 m., and shows that it circumnutated. The bush was 

 15 inches in height. 



Fig. 81. 



Aloysia citriodora : circumnutation of stem, traced from 8.20 A.M. on March 

 22nd to 4 P.M. on 23rd. Plant kept in darkness. Movement raagmtm 

 about 40 times. 



(16.) Verbena melindres (?)(a scarlet-flowered herbaceous var.) 

 (Verbenacesj). A shoot 8 inches in height had been laid hori- 

 zontally, for the sake of observing its apogeotropism, and the 

 terminal portion had grown vertically upwards for a length of 

 11 inches. A glass filament, with a bead at the end, was fixed 



i-ej : circumuutadon of stem in darkness, traced on vertical 

 glass, from 5.30 P.M. on June 5th to 11 A.M. June 7th. Movement of 

 bead magnified 9 times. 



upright to the tip, and its movements were traced during 

 41 h. 30 m. on a vertical glass (Fig. 82). Under these circum- 

 stances the lateral movements were chiefly shown; but as the 

 hues from side to side are not on the same level, the shoot 



