186 THE FIRST BOOK OF BOTANY. 



FIG. 297. 



Invert a tumbler in this way above the roots of a 

 plant placed as in Fig. 296. Do you, in this case, get 

 moisture on the inside of the inverted tumbler ? 

 Can you not make leaves do the work of roots? 



Strip a plant of its leaves and place it under a 

 glass as in Fig. 297, with the roots in water. Place 

 it in the sun as before and see if any moisture gathers 

 upon the glass. 



"What can be done by a plant with leaves, that 

 cannot be done by a plant without leaves ? What, 

 then, is one use of leaves ? 



