28 TWINING PLANTS. Chap. 1 



(Dicotyledons, continued.) 



Ctropegia Qardnerii (Asolepiadacese) moves against the sun. 



H. U, 



Shoot very young. 2 inches K^^ circle was performed in 7 55 



m length ) 



Shoot still young . . . 2nd „ „ „ „ 7 



Long shoot .... 3rd „ „ „ „ 6 33 



Long shoot 4th „ „ „ „ 5 15 



Long shoot 5th „ „ „ „ 6 45 



Stephomotis floribunda (Asolepiadacese) moves against the sun 

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



lloya carnosa (Asclepiadacese) made several circles in from 

 16 hrs. to 22 hrs. or 24 hrs. 



Ipomoea purpurea (Convolvulacese) 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. 

 I Semicircle, from the light in 

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

 30 m. : difference 13 m. 



Jpomceajucunda (Convolvulaoese) moves against the sun, placed 

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



Semicircle, from the light in 

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

 m. : difference 3 hrs. 30 m. 



Semicircle, from the light in 

 3 hrs. 50 m., to the light 1 hr. 

 30 m.: difference 2 hrs 20 m. 



1st circle was made in 5 hrs. 30 m 



2nd circle was made in 5 hrs. 

 20 m. (Late in afternoon : 

 circle completed at 6 hrs. 40 m. 



P.M.) 



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

 retarding and hastening the revolving movement. 



Convolvulus sepium (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. 



