Fig. 30. A covt-rrii I'.'irn yard, in which uiitiiuro is saved mid the itock 

 protected. 



Kij(. SI. A rommon trp« of bam yard. ine»t«in»on Iho Imrn nhow wh«>rr th* 

 mannm wiu ImptltMl fmm the •*▼••: and lb* mudpuddl* abowi wh«r« 

 moeb of th« fvrtlllty ha« |no«. 



