INFECTIOUS DISEASES. 529 



or liind ({uarters, or in severe cases of tli(> \\ hole IkxIv. -w illi treniblinj:^ 

 of the muscles and dryness of the skin. 



If the eyes and mouth ai'e examined the memlnaiies ai-e found icd- 

 dened to a bri<^ht rosy color. The \n\hc is <iuickened and the breatli- 

 ing: may be slightly accelerated. At the end of two days a couj^h 

 is heard and a discliarjre be<rins to come fi-om the nostrils. Tliis dis- 

 charge is at first watery; it then becomes thicker, somewhat bluish in 

 color, and sticky, and finally it assumes the yellowish color of matter 

 and increases greatly in quantity. 



At the outset the colt may sneeze occasionally and a cou^h is heard. 

 The cough is at first repeated and harsh, but soon becomes softer and 

 moist as the disdiarire increases. Acrain, the cougli varies according 

 to the source of the discharge, for in light cases this may be only a 

 catarrh of the nasal canals, or it may be from the throat, the wind- 

 pipe, or the air tul»es of the lungs, or even from the lungs themselves. 

 According to the organ affected the sym]:)toms and character of cough 

 are similar to those of a laryngitis, bronchitis, or lung fever caused 

 by ordinary cold. 



Shortly after the discharge is seen a swelling takes place under tho 

 jaw, or in the intermaxillary space. This is at first puffy, somewhat 

 hot and tender, and finally becomes distinctly so, and an abscess is 

 felt, or having broken itself the discharge is seen dripping from a 

 small opening. "When the discharge from the nostrils has fully de- 

 veloped the fever usually disappears and the aninud regains its ap- 

 petite, unless the swelling is suflicient to interfere with the function 

 of the throat, causing pain on any attempt to swallow. At the end 

 of four or six days the discharge lessens, the soreness around the 

 throat diminishes, the horse regains its appetite, and in two weeks has 

 regained its usual condition. Old and strong horses may have tho 

 disease in so light a form that the fever is not noticeable; they may 

 continue to eat and perform their ordinary work as usual and no 

 sj'mptom may be seen beyond a slight discharge from the nose and a 

 rare cough, which is not sufficient to worry any but the most particu- 

 lar owner. But, on the other hand, the disease may assume a malig- 

 nant form or become complicated so as to become a most sei'ious 

 disease, and even prove fatal in many cases. Inflammation of the 

 iarynx and bronchi, if excessive, produce violent, harsh coughing, 

 which may almost asphyxiate the animal. The large amount of dis- 

 charge may be mixed with air l)y the difficult breathing, and tho 

 nostrils, the front of the animal, manger, and surrounding objects 

 become covered with a white foam. The inllaujiuation may be in the 

 lung itself (lobular pneumonia) and cause the animal to breathe 

 heavily, heave at the flanks, and show great distress. In this condi- 

 tion marked symptoms of fever are seen, the appetite is lost, the coat 

 36414°— IG 34 ^ 



