542 



LECTURE XX. 



A. 



13. 



FIG. 59 (after Duchartre). A, leaf of Mimosa pudica in the diurnal position ; 

 B, in the nocturnal position. 



FIG. 60 (after Darwin). A, Leaves of Hedysarum (Desmodiuni) gyrans> in 

 the diurnal position; B, in the nocturnal position. 



