DUST. 5 



making some wind currents. If dust is present in this 

 current, it will be stirred up to settle back, where it 

 was before, or to be blown to some other place. The 

 more dust or the stronger the wind, the surer it is that 

 the dust will be carried along with the current. 



But why should the housewife spend so much energy why Keer 

 and time in trying to keep her house free from dust? Dust 

 All the dust elements we have seen so far are not likely 

 to do her much harm. The ashes or other mineral dust 

 may scratch the polished table or the brass ornaments 

 and silverware, but not so long as it lies quiet. It is 

 the moving grain of sand, not the still one, that 

 scratches. The other ingredients, bits of dead animal 

 or vegetable matter, may be disagreeable to think of, 

 but they are of the same stuff as ourselves, our clothes, 

 our furniture. If this dead matter were all there is 

 to dust, no one would ever have heard of the science 

 of bacteriology. 



Many of the dailv occurrences in the home give Familiar 



Experience* 



rise to questions which may be readily answered if we 

 will but turn our kitchens into laboratories and try 

 some simple experiments. 



Perhaps you forgot to change the water in a vase of 

 flowers and it stayed there a week. How did it smell 

 when you poured it out ? How did the stems that had 

 been in the dirty water feel? 



Possibly when you left home for a week's visit last 

 summer, you knew the ice was all gone from the refrig- 

 erator, but you forgot to empty the pan underneath. 



