210 



CIECUMNUTATION OF STEMS. Chap. IV. 



31 h. 40 m., and shows that it circumnutaied. The bush wm 

 15 inches in height. 



Fig. 81. 



AJousia citriodoru : civcumnutation of stem, traced from 8 20 A.M. on March 

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

 about 40 times. 



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

 (Verbenace8e).-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 

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



Fig. 82 . 



e'5(fa.iuJBf' 



Verbena TJidind-es: circumnutaiion 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. OQ a vertical glass (Pig. 82). Under these circum- 

 stances the lateral movements were chiefly shown ; but as the 

 lines from side to nide are not on the same level, the shoot 



