320 NASAL CAVITIES. 



Ti-eatmeut of this parasitic coryza consists in trephining the sinuses 

 and destroying the larvae. 



GANGRENOUS CORYZA. 



Gangrenous coryza is a grave disease of diphtheritic character, which 

 at first seems to he localised in the mucous membrane of the upper 

 respiratory passages, but which exhibits a tendency to affect all the 

 mucous membranes of the system. 



The term " gangrenous coryza," adopted in France, has been re- 

 placed in other countries, especially in Germany, by such descriptions as 

 " contagious disease of the head," and " malignant catarrhal fever of the 

 ox." Old writers describe gangrenous coryza as a disease common in the 

 Jura, the eastern parts of France generally, and in the valley of the 

 Saone. In reality this disease occurs everywhere, both in the centre, 

 west and north of France, as well as in the eastern regions. Serious 

 outbreaks frequently occur in Germany and Italy. 



Symptoms. Gangrenous coryza assumes three different forms, which, 

 however, only represent successive degrees of intensity of the attack. 

 In the peracute form death occurs in three to five days, even when the 

 characteristic signs are not all as yet apparent. In the acute, and by 

 far the most frequent form, the disease lasts from fifteen to twenty days, 

 and also ends in death in by far the greater number of cases. Finally, 

 in the form usually termed chronic, the disease lasts from four to eight 

 weeks, and most frequently ends in recovery. 



ilcute ami jieyaviitc forms. — The onset is marked l)y very striking 

 symptoms, which precede the local symptoms l)y some hours, or by a 

 day or more. 



The temperature rises rapidly from the normal to 103° or 105^ 

 Fahr. {'39'5 to 41° C), or even higher. Appetite and rumination are 

 entirely suspended; the respiration becomes rapid and difficult, while 

 the heart beats strongly and tumultuously ; the muzzle is dry, the 

 mouth hot, and salivation so abundant as to suggest an attack of foot- 

 and-mouth disease. Fsces and urine are only passed at long intervals, 

 and dysuria is present. 



At first everything seems to indicate the development of an acute 

 infectious disease ; but soon afterwards appear local indications affect- 

 ing the respiratory, ocular, digestive, urinary, nervous and cutaneous 

 systems. 



The respiratory symptoms are most important, and almost charac- 

 teristic. Eespiration becomes , difficult, rough as in acute coryza, but 

 soon assumes a snoring character, and is accompanied by a discharge, 

 containing false membranes, from both nostrils. 



The serous and muco-purulont discharge becomes rusty or reddish- 



