HOUSES FOR LAYERS. 



41 



but about once a month an inch or two of dry earth 

 may be added. There will be no accumulations under 

 the perches if the birds are not kept too profusely sup- 



plied with gravel at that season, as they should be to 

 induce them to pulverize every portion of the manure 

 and mix it with the dry earth, in search of the gravel 



