544 



Reading-Course for Farmers. 



any body of air becomes colder its ability to hold water is decreased. It 

 comes nearer the point of saturation. In popular language, we say the 

 air has become damper ; in more technical but not more scientific language, 

 we say its relative humidity is higher. (2) An atmosphere whose relative 

 humidity is high is more difficult to withstand in winter and less healthful 

 in summer. 



A damp building is not a healthful building. The writer was re- 

 cently informed by a feeder of wide experience that he had fed cattle 

 both in humid and semi-arid sections of the United States under similar 

 conditions of temperature and that he secured better results from food 

 consumed in the semi-arid sections. 



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Fig. 323. — Method of admitting air into stable. One on right shows method for 

 basem-ent. Which one of other three is best? 



When animals expel from their lungs and skin the warm vapor into 

 the colder room, if the warm vapor is not allowed to escape it is only a 

 qquestion of time until the colder air will cause the vapor to condense into 

 water. This will begin at the coldest places, which are usually the sides 

 of the building, and thus in rooms that are improperly ventilated in cold 

 weather the sides will be seen to be dripping with moisture. The more 

 the vapor which comes from the animals is cooled before it is allowed 

 to escape, the greater the condensation of moisture. Incidentally, it may 

 be pointed out that the more the room is cooled by conduction, the more 

 will be the condensation of moisture ; and the more it is cooled by an 

 actual exchange of air with the outside (which amounts to ventilation) 

 the less the moisture in the room. 



