THE WONDERS OF VEGETATION. 241 



bladder, filled with air, which serves to sustain the 

 plant. The leaf-stalks of the orange expand into real 

 leaves, those of the mimosas often take the place of 

 actual leaves, which remain abortive ; and those of 

 other plants, such as cherry-trees and apricot-trees, 

 bear glands which correspond exactly to the cells 

 that line the interior of the cups. 



In the marvellously beautiful ice-plant of the Ori 



Pyralis of Viae. 



