CLEANLINESS 



451 



filtered through beds of sand and gravel, and the .sewage is 

 thus freed of organic impurities. 



Cleanliness. Every year we are learning more and more 

 about disease. The World War has demonstrated in a 

 wonderful manner the advances which have been made in 



A PRIMITIVE WASHING SCENE IN MEXICO 



life saving as well as in life destruction. Diseases like small- 

 pox, typhoid fever, and bubonic plague, which were for- 

 merly dreaded so greatly by armies, have been practically 

 eradicated. Wounds which only a few years ago were al- 

 ways fatal are now easily healed. All of this has come about 

 because of our increased knowledge of disease germs and 

 how to combat them. 



