MORPHOLOGY AND ECOLOGY OF THE FLOWER 243 



never be allowed to interfere with the clearness of the ground 

 plan of the flower. 



In laboratory study, students cannot do much if any practical 

 work on cross-pollination, but it is well to keep the matter before 



FIG. 27. Diagrams of Fuchsia flower. Shading as in Figs. 25 and 26. 



their attention, particularly in flowers like the Fuchsia, which 

 shows splendid nectar glands, and in irregular flowers where the 

 alighting-place and definite path of the insect can be traced. 

 Something can be accomplished in the laboratory by imitating 



