ADJUSTMENT TO SURROUNDINGS 



145 



FIG. 104. Effect of removal of a leaflet from a palmately compound 

 leaf (e.g. Woodbine). B, normal leaf; C, after removal of upper right-hand 

 leaflet. A, Unbroken lines represent average normal position of leaflets; 

 dotted lines, average position of leaflets after operation; barred line, posi- 

 tion of leaflet removed. (A, after Zeleny.) 



FIG. 105. Motherwort (Leonurus Cardiaca), showing adjustment of 

 leaves to light. This plant grew at the edge of shrubbery, receiving rela- 

 tively little light from behind. 



10 



