Chap. I. TWINING PLANTS. 29 



(Dicotyledons, continued.) 



Rivea tiUcefolia (Convolvulaceae) moves against the sun; 

 made four revolutions in 9 hrs. ; so that, on an average, each 

 was performed in 2 hrs. 15 m. 



Plumbago rosea (Plumbaginacese) follows the sun. The shoot 

 did not begin to revolve until nearly a yard in height ; it then 

 made a fine circle in 10 hrs. 45 m. During the next few days it 

 continued to move, but irregularly. On August 15th the shoot 

 followed, during a period of 10 hrs. 40 m., a long and deeply 

 zigzag course and then made a broad ellipse. The figure 

 apparently represented three ellipses, each of which averaged 

 3 hrs. 33 m. for its completion. 



Jasminum pauciflorum, Bentham (Jasminaceae), moves against 

 the sun. A circle was made in 7 hrs. 15 m., and a second rather 

 more quickly. 



Clerodendrum Thomsonii (Verbenaceae) follows the sun. 



H. M. 



5 45 (shoot very young) 



[(directly after the 

 plant was shaken 

 on being moved) 



Tecoma jasminoides (Bignoniacese) moves against the sun. 



H. H. 



March 17, 1st circle was made in . 6 30 



19,2nd .70 



22, 3rd .8 30 (very cold day) 



24, 4th .6 45 



Tkunbergia alata (Acanthacese) moves against sun. 



April 14, 1st circle was made in . 3 20 

 18, 2nd . 2 50 

 18, 3rd .2 55 

 18, 4th .3 55 (late in afternoon) 



