DISEASES OF POULTRY. 197 



applied sparingly and after the others mentioned have 

 proved ineffectual. 



This local treatment should be accompanied by 

 cleaning and disinfection of the houses, and, if possi- 

 ble, changing to new, uninfected runs. The feeding 

 troughs and drinking vessels should be daily washed 

 with boiling water. 



When the disease first appears in a flock the affected 

 birds should be at once isolated and treated, and the 

 effort made by disinfection to prevent the further ex- 

 tension of the contagion. 



