64 SCIENCE PRIMERS. [xiv. 



them (Sect. XX), and it also often protects the parts 

 of the flower within it. The many colours of flowers, 

 their various shapes and scents, and their honey, are 

 so many baits, for insects especially. 



93. The corolla is inserted on the receptacle (Par. 

 82 e) in the butter-cup; on the calyx in the apple 

 (Fig. 32) and rose (Fig. 31); in flowers with a superior 

 calyx (campanula), apparently on the top of the ovary, 

 but really on the calyx or peduncle, where these 

 become free from the ovary. 



94. The petals of the corolla may be free from one 

 another, when the corolla is polypetalous (buttercup, 

 Fig. 22) ; or combined, when it is monopetalous 

 (primrose, Fig. 29). 



FIG. 43. Spotted orchis-flower, enlarged. 



95. The so-called irregularity or regularity of flowers 

 (Par. 83) depends mainly upon the form of the corolla, 

 and has reference to the visits of insects, &c. for the 



