CHAP, xiv INSECTIVOROUS PLANTS 75 



2. The contraction just under the 



3. Blade which consists of two parts. 



4. The teeth upon the margins of the blade. 



5. The bristles upon the upper surface of the leaf-blade. 



6. Notice especially this upper surface of the blade. 



7. Make sketches to show these points. 



V. Irritate the blade by touching the bristles upon the 

 upper surface and notice the details of its movements. 

 Describe them. How long does it take to close? Does 

 it open again? 



VI. Place a small piece of meat upon the upper surface 

 of the lamina. Watch and take notes for several days. 



VII. Examine an expanded (i.e. open) leaf of the 

 Common Sundew and notice : 



1. The slender petiole. 



2. The thick rounded blade with 



3. The projecting glands upon their stalks, covering the 



upper surface. 



4. Make sketches to show these characters. 



VIII. Place a small piece of meat upon the centre of the 

 upper surface of an expanded leaf, and notice what happens. 

 What parts move first? next? next? and so on. Keep 

 watching the plant as you have opportunity for several 

 days. 



IX. What is the difference as regards the method of 

 capturing the prey between the two Pitcher Plants on the 

 one hand, and the Venus Fly-trap and the Sundew on the 

 other? Write your answer. 



X. Are the Insectivorous Plants parasites or saprophytes r 

 Why? 



