56 IMMUNITY 



The benzol molecule CeH 6 is here represented graphically as a 

 ring with a central nucleus of C 6 with lateral chains of H. con- 

 necting each atom of C. 



If one of these lateral chains H. is supplanted by the acid radical 

 COOH. the benzol is converted into benzoic acid and its formula is 

 represented thus: 



O 



y 



C OH 



H C ^C H 



H C C H 



H 



BENZOIC ACID. 



If to this acid radical of the benzoic ring, sodium hydroxid 

 unites, supplanting an H in the OH of this radical, we have, 

 instead of benzoic acid, benzoate of soda. . 



O 



y 



C O Na 



/\ 

 H C C H 



II I 

 H C C H 



\y 



C 



I 



H 



BENZOATE OF SODA. 



