No. 4.] 



POULTRY HOUSING. 



393 



To keep the temperature in the house up as high as re- 

 quired by this theory of housing, the house must either be 



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kept shut so close that the heat from the fowls keeps uj) the 

 temperature, or must be heated artificially. 



Artiticial heating in houses for laying stock has been tried 

 many times, but generally discarded as unsatisfactory, and 



