18 MR. DARWIN ON CLIMBING PLANTS. 



(Dicotyledons, continued.) 



a semicircle in 24 h. ; subsequently made a circlo in between 40 h. and 48 h. ; sub- 

 sequently did not complete a circle in 50 h. Another shoot, however, made a 

 circle in 26 h. 30 m. 



Mikania scandens (Composite) moves against the sun. 

 h. m. 

 March 14, 1st circle 3 10 



)> 



15, 2nd 



h 3 



n 



16, 3rd 



„ 3 



>> 



17, 4th 



„ 3 33 



iri] 



7, 5th 



„ 2 50 





7, 6th 



„ 2 40- 



f This circle was made after a copious intentional 

 I watering with cold water at 47° Falir. 



Combretum argenteum (Combretaceaj) moves against the sun. 



~ 5J; f Early in morning, when the tompera- 



an. •, s nee « ^ tureof the house had fallen a little. 



„ 24, 2 circles, each at an "i 2 20 



average of J 2 20 



„ 25, 4th circle 2 25 



Combretum purpurea m revolves not quite so quickly as C. argenteum. 

 Loasa aurantiaca (Loasacere). First plant moved against the sun. 



li. m. 



h. m. 



June 20,1st circle 2 37 



„ 20,2nd „ 2 13 



„ 20,3rd „ 4 



Second plant followed the sun. ^. m. 



July 11, 1st circle 1 51 



June 21, 4th circle 2 35 



„ 22,5th „ 3 26 



„ 23,6th „ 3 5 



H ' 2nd » * 46 r Very hot day. 



11,3rd „ 1 41 ■ 



„ 11,4th „ 1 48 



„ 12,5th „ ..'. 2 35 Cool morning. 



Scyphanthus elegans (Loasaccie) follows the sun. 



b< ">■ h. in. 



June 14, 4th circle 1 55) 



„ 14, 5th „ 2 3 



June 13, 1st circle 1 45 



„ 13,2nd „ 1 17 



„ 14, 3rd „ 1 36 



tiiphomeris or Lecontea (unnamed sp.) (Cinchonaceic) follows the sun. 



h. m. 



May 25, semicircle 10 27 (shoot extremely young). 



,, 26, 1st circle 10 15 (shoot still young). 



„ 30,2nd „ 8 55 



June 2, 3rd „ 8 11 



„ 6,4th „ 6 8 



„ 8, 5th „ 7 20 1 Taken from the hothouse and placed 



„ 9, 6th „ 8 36 J in a room in my house. 



Manettia bicolor (Cinchonacea 1 ), young pla)it, follows the sun. 



h. in. 



6 18 



6 53 



6 30 



July 



7, 



1st circle 



)> 



8, 



2nd 



)> 



» 



9, 



3rd 



» 



