156 



LEAVES 



shine does not fall strongly, and await results. After half 

 an hour what do you find forming on the inside of the glass 

 or tube ? How do you account for this ? 



FIG. 67. 



FIG. 68. 



Conclusion. State what this experiment proves. 



Query. If leaves are constantly giving off water, how does 

 it affect the air ? How do you account for its wilting when 

 a leaf is removed from its stem? Why does the United 

 States government encourage tree planting in the Western 

 states ? 



137. LEAVES 

 Object. To show that leaves give off water. 



Apparatus. Two tumblers, blotting paper, two leaves, and two 

 plates. 



Method. Line one tumbler with blotting paper and 

 dampen it, but do not have it wet enough to drip. Wipe 

 the other dry. Place a leaf in each tumbler and cover them 

 with the plates. After one hour remove both leaves. How 



