30 BOTANY FOR YOUNG PEOPLE. 



E. The food taken into the stomach after 

 eating, is digested, and then goes through a 

 variety of processes, which terminates by pass- 

 ing it through the lungs, at which place carbo- 

 nic acid is thrown out and oxygen received. 

 Plants take their food by means of little bundles 

 of leech-like mouths fixed at the end of their 

 roots, termed spongioles ; these suck from the 

 soil whatever is necessary to the support of the 

 plant, and then act the part of stomachs by im- 

 mediately digesting it. A set of vessels carries it 

 up to the leaves to be further elaborated, while 

 there, a supply of carbon, a substance which 

 makes most of the body of the plant, is received, 

 and a corresponding amount of oxygen thrown 

 off, and the sap, thus purified, goes the rounds 

 of the system in another set of vessels, to supply 

 its necessities and form its compounds. 



L. Then the odors of Rose and Lemon, and 

 Cinnamon, are made of nothing but air and 

 water. 



E. The elements of their composition are 

 mostly derived from the substances you have 

 named. In the human system are a set of 

 bodies called glands, whose office it is to make 

 up or combine the various secretions required in 



