8 



The symptoms are much the same when the lungs are the seat of 

 the disease. In dead roupy fowls we have often found the higher 

 bronchial tubes completely filled with solid cheesy matter, which pre- 

 vented the air from passing into the lungs. 



Occasionally cheesy matters are found in the folds of the pleura, 

 and in other situations. 



The Course of the Disease. 



The course of roup is usually of long duration. A simple, putrid 

 discharge from the nose may stop in three or four weeks, and similarly 

 false membranes may soon disappear ; but generally the symptoms 



^Fig. 5. — Head of hen 8.5; eight days after infection witli a 

 culture of the ro ip bacillus — a, cheesy matter. 



ast for months. When the eyelids become swollen and tumours 

 appear, the case is usually chronic. Affected birds may be better for 

 a few days or weeks, and then becorce very weak again. Damp, cold 

 weather usually intensifies the disease. 



It is well known that fowls may be more or less sick from roup 

 for one or even several years ; and these birds should have the great- 

 est care and attention, for they are generally the cause of new out- 

 breaks. Once introduced, roup may remain in a flock for many years. 

 The first cold and moist nights of the fall and early winter cause all 

 kinds of catarrhs, which in many instances are followed by roup. 

 Roup spreads rapidly in the winter time, and may attack from 10 to 

 90 per cent, of the fowls in a flock. Towards spring, the disease 

 gradually disappears ; during the summer months, a few birds remain 



