RESPIRATORY DISEASES 



151 



shut), and quite frequently there is a bulging of 

 the sinus (cavity) in front and below the eye. This 

 is due to an accumulation of the inflammatory pro- 

 ducts in this sinus. Fig. 47 illustrates this com- 

 mon swelling. 



2. The diphtheric type.— This, type affects the 

 mouth. This often accompanies the nasal form. 

 Fig. 48 illustrates these diphtheric ulcerations, 

 which are yellowish or yellowish-white in color. 



Fic. 47. Roup in a Chicken 

 A, Bulging of infraorbital or maxillary sinus. 



From these necrosing patches the disease receives 

 its name, avian diphtheria. 



3. The ocular type. — ^In this form there is first 

 noted an inflammation of the mucous membrane 

 covering the anterior portion of the eyeball (con- 

 junctivitis). As the disease progresses, the ca- 

 tarrhal product accumulates as a watery, clot-like 

 mass, whitish in color. The eyelids stick together 

 and hold the material as it accumulates, till the 

 part bulges outward. 



There is noted sneezing, shaking the head, and 



