176 ELEMENTS OF BOTANY. 
rain. Sometimes the flower both changes its position and 
closes, as is the case with the herb Robert and the sweet 
scabious, Fig. 158. The adaptations of flowers to protect 
their pollen from being wetted can best be made out by 
actually examining the same flower in sunshine and during 
rain. 
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Fic. 158. — Protection of Pollen from Moisture. 
I, herb Robert insunny weather ; II, sweet scabious in sunny weather ; II, sweet 
scabious during rain ; IV, herb Robert during rain. 
213. Detailed Study of Flowers. — Now that the student has learned 
something of the adaptations of flowers to insect-visitors, he is able to 
carry on such studies as those of Chapter XV in more detail. After 
making a careful examination of the flower as a whole and of its parts, 
