LEAF EXPOSURE TO SUN AND AIR 149 



revolving table before a window and slowly turned during 

 the hours of daylight? 



158. Review Summary of Chapter X. 



f For vertical twigs 

 Leaf arrangement . . . <*_ . . J _ , . 



L r or horizontal twigs 



f Apparatus for 



Movements of leaves . . Causes of 



[ Uses of 



Compass-plants .... 



TT ,.,.,,. f Positive 



Heliotropic bending of stems < 



