158 EFFECTS OF HEAT. 



evaporates, it keeps absorbing heat from 

 the body, which makes it feel cold. 



Q. Why do WET FEET or CLOTHES give us 

 "COLD?" 



A. Because the evaporation absorbs 

 heat from the body so abundantly, that it 

 is lowered below its natural standard; 

 and therefore health is injured. 



Q. Why is it DANGEROUS to SLEEP in a DAMP 



BED ? 



A. Because the heat of the body is 

 continually absorbed in converting the 

 damp of the sheets into vapour ; and as 

 heat is abstracted from the body, its 

 temperature is reduced below the healthy 

 standard. 



Q. Why do we not feel the same sensation of 

 cold, if we throw a MACINTOSH over our WET 



CLOTHES ? 



A. The macintosh prevents evapora- 

 tion, because the steam cannot escape 

 through the air-tight fabric ; and (as the 

 wet cannot evaporate from the clothes) 

 no heat is absorbed from our bodies. 



do NOT SAILORS get COLD, who are 

 so often wet all day with SEA-WATER ? 



