LEA VES. 



You send out of your body what C 



you do not want, and you take 



in from the air what you do 



want. Now there are dotted F j g> 2 o. Surface of a leaf 



about upon the leaves a lot of 



little openings or mouths. You 



cannot see them without a glass 



to magnify the leaves that is, 



to make them appear larger 



but they are there. Through 



them the plant sends out what 



it does not want, and takes in 



fresh nourishment from the air, 



Fig. 21. Another surface of 



and the sap carries it away to i ea f, more highly magnified. 

 help the whole plant to grow. 



You will now understand how necessary it is if 

 you have any plants in the house, not only to water 

 them at the roots. If you let them get dusty, the 

 little mouths upon their leaves get choked ; so you 

 must take them out now and then, and water them all 

 over. They will enjoy it, and benefit by it, just as 

 you enjoy your cleansing and refreshing bath. 



