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There are quantities of dustj 

 floating in the air of the-ordi-j 

 nary ; schoolroom, brought in 

 from the streets and raised 

 from the floor by the constant 

 movement _ of . the children' s 

 feet. 



Science ~ has " proved that 

 dust is a favorite nesting 

 place for disease germs. 



It follows that at every 

 breath the children are in 

 danger of being infected by 

 the germs contained in the 

 floating dust they inhale. 



The best known prevent- 

 ive of disease-carrying dust 

 is Standard Floor Dressing. 

 Standard Floor Dressing catches 

 all dust the instant it settles on the 

 floor and holds it there, together with 

 the germs the dust contains. At the 

 end of the day dust and germs are 

 easily swept away without again ris- 

 ing into the air. 



The air is thus kept untainted ; the spread 

 of disease is checked at the outset. 



Our free illustrated booklet on dust, 

 dangers and how to avoid them con- 

 tains information of special value to 

 principals of schools and all others 

 in a position to promote hygienic 

 conditions among children. Post- 

 paid on request. Write for it today. 

 Not intended for household use. 



Standard Oil Company 



(Incorporated) 



