176 ELEMENTS OF BOTANT. 



rain. Sometimes the flower botii 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 



1 II III IV 



Fig. 158. — Protection of Pollen from Moisture. 



I, lierb Robert in sunny weather ; II, sweet scabious in sunny weather ; III, 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. 



