LEAVES 



2. The method of folding together the parts of a leaf after 



it has been touched. Sketch. 



3. The time elapsing, after touching, before it begins to fold 



together. 



4. The time elapsing before the parts are completely folded 



together. 



5. Make sketches to show these changes. 



6. How long does it require to open again? 



XIII. Examine the leaf of the Orange (or of the Bar- 

 berry of New England) and notice : 



1. That the stalk is flattened -and jointed at the insertion of 



2. The blade. 



3. Make a sketch to show this. 



4. This joint indicates that the " blade " answers to a leaf- 



let of a compound leaf, and if we examine some of 

 the nearly related Barberries or members of the 

 Orange family, we shall find that the leaves are 

 pinnately compound with several leaflets. Such a 

 leaf as the one studied is called a tinifoliolate com- 

 pound fea/a.nd it is considered that the side leaflets 

 have failed to develop. 



XIV. Longevity of Leaves. 



1. How long (i.e, how many months) do the leaves of the 



Willows, the Maples, or the Elms live? 



2. How long do the leaves of the Live-oaks live? (Take a 



piece of stem with the oldest leaves you can find, cut 

 it across, and count the rings.) 



3. How long do the leaves of the Norway Spruce, the various 



Pines, or Cypresses live ? 



