THE NUTRITION OF PLANTS. 



159' 



the water, and if it attempts to escape by crawling up the 

 sides of the urn, the thicket of downward-pointing hairs 

 prevents. If it seeks to fly away from the rim, it flics 

 towards the translucent spots in the hood, which look like 

 the way of escape, as the direction of entrance is in the 

 shadow of the hood. Pounding against the hood, the fly 

 falls into the tvibe. This Southern pitcher plant is known 



Via. 150. Two leaves of a sim-dew. The one to the right has its glandular hairs 

 fully expanded ; tlu' one to the left shows half of the hairs bending inward, in the 

 position assumed \\ hen an insect has been captured. — .Vfter Kerner. 



as a great fly-catcher, and the urns are tif ten well supplied 

 with the decaying bodies of these insects. 



A much larger Californian pitcher plant has still more 

 elaborate contrivances for attracting insects (see Fig. l-ts). 



(2) Drosera. — The droseras are commonly known as 

 " sun-dews," and grow in swampy regions, the leaves form- 

 ing small rosettes on the ground (see Fig. 149). In one 

 form the leaf blade is round, and the margin is beset by 

 prominent bristle-like hairs, each with a globular gland at 

 its tip (see Fig. 150). Shorter gland-bearing hairs are 



