42 DISEASES OF THE BRONCHI 



floor is of earth it should be removed to the depth of six 

 inches and filled in with fresh uninfested clay or cemented. 

 Infested fields should be thoroughly tile-drained and culti- 

 vated. Many sheep owners recommend that tobacco 

 leaves mixed with salt be made accessible to the sheep at all 

 times. .Sulphate of iron and salt may be fed once weekly 

 \vith the grain. 



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