256 AIR. 



membrane called the drum (or tympa- 

 num), through which the dense air 

 bursts, and the rupture very often pro- 

 duces incurable deafness. 



Q. Why do our CORNS ache just previous to 



RAIN? 



A. Previous to rain, the density of 

 air is greatly lowered (as every one knows 

 from the fall of the barometer) \ in con- 

 sequence of an unequal pressure, our 

 feet swell; but the hard corn, not being 

 elastic, is painfully stretched and pressed. 



(Some of this pain is due to electricity.) 

 Q. Why do CELLARS feel WARM in WINTER ? 

 A. As the external air has not free 

 access into cellars, they remain at a pretty 

 even temperature, which (in winter time) 

 is about 10 degrees warmer than the 

 external air. 



Q. Why do CELLARS feel COLD in SUMMER 

 time ? 



A. As the external air has not free 

 access into cellars, they remain at a pretty 

 even temperature, which (in summer time) 

 is about 10 degrees colder than the 

 external air. 



