CHAP. IV. 



DICOTYLEDONS. 



251 



the leaf manifestly circumnutated. It does not appear from the 

 diagram that the leaves move periodically, for the descending 

 course during the first two nights, was clearly due to epinastic 



. 31 s ." 



Fig. 113. 



Pinus pinaster: circumnutation of young leaf, traced from 11.45 A.M. 

 July JUst to 8.20 A.M. Aug. 4th. At 7 A.M. Aug. 2nd the pot was 

 moved an inch to one side, so that the tracing consists of two figures. 

 Apex of leaf 14^ inches from the vertical glass, so movements much 

 magnified. 



growth, and at the close of our observations the leaf was not 

 nearly so horizontal as it would ultimately become. 



Pinus austriaca. Two leaves, 3 inches in length, but not 



