There are quantities of dust 
floating in the air of the -ordi- 
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. 
s 
easily swept away without again ris- 
ing into the air. 
The air is thus kept untainted; the spread 
i utset. 
of disease is checked at the o 
Our free illustrated booklet om dust 
dangers and how to avoid them con- 
paid on request. Write for it today. 
Not intended for household use. 
Standard Oil Company 
: ——— 
