28 TWINING PLANTS. Cuar. L 
(DicoTYLEDons, continued.) 
Ceropegia Gardnerii (Asclepiadaceze) moves against the sun. 
H. OM. 
Shoot very young, 2 inches 
in length 4 
Shoot stillyoung . . . 2nd , 4, 4 4 +7 0 
Long shoot ye Se iee tgs BEd.' sy ” ” ” 6 33 
Longshoot . . . . . 4th ,, ” ” » 5 15 
Long shoot . . . . . Sth ,, ” ” ” 6 45 
Shast circle was performed in 7 55 
Stephanotis floribunda (Asclepiadaceze) moves against the sun 
and made a circle in 6 hrs. 40 m., a second circle in about 9 hrs. 
Hoya carnosa (Asclepiadaceze) made several circles in from 
16 hrs. to 22 hrs. or 24 hrs. 
Ipomea purpurea (Convolvulacese) moves against the sun. 
Plant placed in room with lateral light. 
Semicircle, from the light in 
Ist circle was made in 2 hrs. 42m.) 1 hr. 14 m, to the light 
Lhr.28m.: difference 14m. 
Semicircle, from the light in 
2nd circle was made in 2 hrs. 47m.{ 1 hr. 17 m., to the light 1 hr. 
30 m.: difference 13 m. 
Ipomea jucunda (Convolvulacez) moves against the sun, placed 
in my study, with windows facing the north-east. Weather hot. 
Semicircle, from the light in 
1st circle was made in 5 hrs. 30 m.) 4 hrs. 30 m., to the light 1 hr. 
0 m.: difference 3 hrs. 30 m. 
Qnd circle was made in 5 hrs. 
20m. (Late in afternoon: 
circle completed at 6 hrs. 40m. 
P.M.) 
Semicircle, from the light in 
dhrs. 50 m., to the light Lhr. 
80m.: difference 2 hrs 20 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. 
