210 



CIKCUMNUTATION OF STEMS. Cuap. IV. 



31 h. 40 m., and shows that it circnmnutated. The bubh wns 

 16 inches in height. 



Fig. 81. 



Alousia citriodora : civcumnutation of stem, traced from 8 20 A.M. on March 

 22nd to 4 P.M. on •23rd. Plant kept in darkness. Movement r.iagnihed 

 about 40 times. 



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

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

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

 terminal portion had grown Tertioally upwards for a length of 

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



Fi,;. 82 . 



30'p.m.l^ 



0'50'a.m.e". 



Verbena m-lind-es: circumnutatlon of stem in darkness, traced on vertical 

 glass, from 5.30 P.M. on June otli to 11 A.M. June 7tli. 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 

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



