174 



AN EGG FARM. 



nary yard will. The birds will take more exercise even 

 than the farmer's flock, which runs at large. For the flock 

 in a yard or on a free range will walk, while those in the 

 runway will run, that's the difference. The surface of 



FIG. 77. INTERIOR ALTERNATE SYSTEM. SKE FIGS. 128 AND 130. 



an ordinary yard becomes, in a short time, as bare as 

 the desert of Sahara. It affords not the slightest incen- 

 tive to exertion. There is no more vegetation growing 

 on it than on the lid of a copper teakettle, and it is 



