DIPHTHERIA IN FOWLS 487 
Fic. 112. EARLY STAGES OF DIPHTHERITIC NECROSIS IN THE THROAT OF A PIGEON, 
cult. The mucous membranes of the mouth and pharynx are con- 
gested and show numerous dark red elevations covered with fibrinous 
exudate. The patches on the tongue have increased in size, they are 
gray in color, dried along the edges of the tongue but soft and flattened 
upon its upper surface. They are covered with a membranous exud- 
ate. The voice often fails. 
In the acute cases, recovery or death follows in a few days. In 
chronic ones the fowl may live for weeks or months. 
Morbid anatomy. The lesions are largely localized on the mucosa 
of the head. With the exception of emaciation, there are no general 
Fic. 113. A SECTION THROUGH A DIPHTHERITIC EXUDATE, LATE IN THE COURSE OF 
THE DISEASE, FROM A PIGEON’S THROAT. 
