2S TWINING PLANTS. Chap. I 



(Dicotyledons, continued.) 



Ctropegia Qardnerii (Asclepiadacese) moves against the sun. 



H. M. 



Shoot very young. 2 inches ) - . . , , . _ 



.... > 1st circle was performed in 7 5o 



in length ) r 



Shoot still young . . . 2nd 



Long shoot . 3rd 



Long shoot 4th 



Long shoot 5th 



> 



Stephanotis floribunda (Asclepiadacese) moves against the sun 

 and made a circle in 6 hrs. 40 m., a second circle in about 9 hrs. 



Hoya carnosa (Asclepiadacese) made several circles in from 

 16 hrs. to 22 hrs. or 24 hrs. 



JpomcEa purpurea (Convolvulacess) moves against the sun. 

 Plant placed in room with lateral light. 



! Semicircle, from the light in 

 1 hr. 14 m., to the light 

 1 hr. 28 m. : difference 14 m. 

 (Semicircle, from the light in 

 1 hr. 17 m., to the light 1 hr. 

 30 m. : difference 13 m. 



Ipomcea jucunda (Convolvulacese) moves against the sun, placed 

 in my study, with windows facing the north-east. Weather hot. 



1st circle was made in 5 hrs. 30 m.. 

 2nd circle was made in 5 hrs. 



Semicircle, from the light in 

 4 hrs. 30 m., to the light 1 hr. 

 m. : difference 3 hrs. 30 m. 



i Semicircle, from the light in 

 3 hrs. 50 m, to the light lhr. 

 30 m. -.difference 2 hrs 20 m. 



We have here a remarkable instance of the power of light in 

 retarding and hastening the revolving movement. 



Convolvulus sepiura (large-flowered cultivated var) moves 

 against the sun. Two circles, were made each in 1 hr. 42 m. : 

 difference in semicircle from and to the light 14 m. 



