158 



Diseases of Poidtnj 



When the inflammation reaches the spaces or sacs beneath 

 the eyes it causes the formation of a secretion very similar 

 to that of the nose, and as this becomes thick it collects, dis- 

 tends the walls of these spaces, and produces a warm and 

 painful swelling, which is seen just below the eyes and may 

 reach the size of a hickory nut. This swelling presses with 

 much force on the eyeball, which is displaced and more or 



Fig. 30. — Showing appearance of a hen a day before death from roup. 

 (After Harrison and Streit.) 



less deformed ; and in extreme cases even the bones of the 

 head may give way before it. 



The closure of the eyes prevents the badly affected birds 

 from finding food ; the accumulation of mucus in the nostrils 

 completely obstructs these passages, so that the beak must 

 be kept open in order to breathe; the obstruction of the 

 windpipe and the smaller air tubes causes loud breathing 

 sounds and difficult respiration. 



In the severe and advanced cases the birds sit in a som- 

 nolent or semiconscious condition, unable to see or to eat ; 

 their strength is rapidly exhausted, and many of them die 

 within a week or ten days. A part of the affected indi- 



