210 



CIKCUMNUTATIOJf OF STEMS. 



Chap. IV. 



31 h. 40 m., and shows that it civcumnutafed. The buah waa 

 15 inches in height. 



Fig. 81. 



Aloysia citriodora : circumnutation of stem, traced from 8 20 A.M. on March 

 22ad to 4 P.M. on 23rd. Plaat kept ia darkness. Movement magnified 

 about 40 times. 



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

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

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

 terminal portion had grown Yertioally upwards for a length of 

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



'a.in. 7^ 



82. 



30'^m.ff? 



Vorbena mfndres: o.rcumQutatlon of stem in darkness, traced on vertical 

 fe^m^gnile^Vtrme: ''"' ''' " " '■''■ ^""^ "'^- *'"— "^ 



upright to the tip, and its movements were traced during 

 11 h. 30 m. on a vertical glass (Pig. 82). Under these circum- 

 stances the lateral movements were chiefly shown; but as the 

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



