LABORATORY PRACTICE 



II. Examine a leaf of the Californian Darlingtonia and 

 notice : 



1. The general shape, size, color, etc. 



2. The parts 



(a) lower slender portion and 



(b) upper hood-shaped portion of the petiole ; 



(c) the split blade hanging out "mustache fashion" 



beyond 



(d) the elliptical opening with its incurved rim. 



3. Make sketches to show these parts and label. 



III. Cut a leaf open and notice : 



1. The transparent spots (^windows"} and 



2. The downwardly projecting hairs within the hood. 



3. The smooth inner walls of the slender tube. 



4. The contents, solid and liquid, of the lower part of the 



tube. 



5. Write out the story of the trapping of an insect by this 



leaf. 



Where does it alight? 

 What is the rim of the opening for ? 

 What are the hairs for? 

 Why do they point the way they do ? 

 What are the windows for? 

 What is the smooth surface for? 

 What is the liquid for? 



Is this liquid produced by the plant or not? Give 

 the reasons for your answers. 



IV. Examine the leaves of a healthy plant of the Venus 

 Fly-trap, and notice : 



i. The petiole, flattened, with a longitudinal groove through 

 the middle. 



