POULTRY DISEASES AND THEIR TREATMENT. Ill 



the fumes of burning sulphui* or burning tar or the steam of 

 boiling tar water has been recommended. 



If a flock is infested with this parasite it is best when 

 possible to start a new flock with incubator chicks raised on a 

 new range and carefully protected from infection from the old 

 flock. Or stock may be purchased from an uninfested flock. 

 Birds with this parasite should not be bought or sold for breed- 

 ing or laying purposes, as the flock into which they are intro- 

 duced will become infested from them. Since this parasite can 

 not live long outside the bird's body, the houses, runs, etc., do 

 not remain infested long after all the diseased birds have been 

 removed. 



Prognosis. — A bird once infected is probably never free from 

 the parasite but may live a long time little harmed by its presence. 



