70 Vcterina?y Medicine. 



mouth and end in an early recovery, or it may extend to the 

 organs of the chest and abdomen, or tlie germs may proliferate 

 largely in the blood and induce fatal results. On the other hand 

 it ma}' become subacute or even chronic, and, as already noted in 

 the case of the parent pigeons, it may persist as an infecting 

 disease without materially injuring the general health of a com- 

 paratively, immune animal. 



The affected nasal passages become filled b}' frothy liquid and 

 blocked by false membranes, so that the bird is driven to breath 

 through the open mouth. The skin around the nares, and eye- 

 lids and the cavity beneath the eye mav be covered with the false 

 membrane, by the increase of this product the bones maj' be 

 driven out of place, so that the palatines press downward, the 

 e\'eball is pressed outward and the root of the beak may seem 

 swollen. The false membranes that form on the skiii or reach 

 the surface are soft, creamy, cheesy, or dry, granular and friable. 



When the eye is specially affected there are swelling of the 

 lids, profuse lachrymation, closure of the lids by adhesion, and 

 formation around their borders or on their inner surface and on 

 the membrana nictitans of false membranes which press the lids 

 outward more or less unevenly, and may be easily recognized 

 when the lid is everted. The cornea and even the iuterior of the 

 eye may suffer, leading to perforation, internal tension, and in 

 some cases atrophy, with permanent blindness. 



The tongue may suffer on the tip as \\\ pip, or on its dorsum, 

 from which the disease extends to the larynx, trachea and even the 

 air sacks, which become filled with false membranes, that are 

 coughed up, and decomposing in the mouth, add to the infection 

 and fcetor. Dyspnoea and cyanosis of comb and wattles are 

 marked features. 



The extension may take place downward along the alimentarj' 

 track, the false membranes forming on \.\\q gullet or c?'op and in- 

 terfering with swallowing or digestion, or on X.\\(t intestine s.n(\ 

 determining a foetid, often greenish or i)loody diarrhoea with in- 

 dications of false membranes. Vomiting maj' be a marked 

 symptom. 



The ski7i is usually attacked secondaril}' around the margin of 

 the beak, the eyelids, the nares, the ears, the comb, the wattles, 

 the anus, but it may develop at any point where the infecting 

 material has touched an abraded surface. 



