156 
THE FIRST BOOK OF BOTANY. 
Pour into the tumbler water enough to cover the 
roots, and expose the leaves to sunshine. 
Into another tumbler of water with a similar 
cover put a second plant, leaves downward, as shown 
in Fig. 248, and expose it to sunshine. 
Fig. 248. 
After a few hours, compare the two plants. How 
has it fared with the one that had its roots in water ? 
What is the appearance of the other? 
Let us now find, if we can, what was going on in 
the plant that kept up its freshness. 
Arrange a glass of water with a cover of slit card¬ 
board as before. Place in it a plant, root downward, 
and cover the leaves with a glass, as shown in Fig 0 
249. Let it stand for a time in the sunshine. In a 
little while look at the inverted tumbler. What do 
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