424 



MODIFIED CIECUMNUTATION. Chap. Vlll 



Bimilar to the previous one. In these two cases there could )>e 

 no doubt that the ordinary circumnutating movement of the 

 hypoootyl was modified and rendered heliotropic. 



Kig. 171. 



5 53 



t3:4S' 



JO'.SO'ajn, 



O'^.m. 



S'JS'a.m.* 



lO'-SO'a.Tn. 



Ap'03 qrnreolens ; heliotropic movement .ind circumnutation of the hvpo- 

 ccty's of two seedlings towards a dim lateral light, traced on a horizontal 

 glass during the day. The broken lines show their return nocturnal 

 courses. Height of hypocotyl of A '5, and of B -55 inch. Figure reduced 

 to one-half of original scale. 



Bransica oleracea. — The hypocotyl of the cabbage, when not 

 disturbed by a lateral light, circumnutates in a complicated 



