1]0 DISEASES OF THE IJOG. 



Causes: Season and locality; it is more preva- 

 lent in the cold weather than in summer; sudden 

 variations of temperature, especially if it is wet; 

 particular states of the health, it being more liable 

 to attack animals weakened by previous disease. 

 It is sometimes the result of catarrh and sore throat 

 especially if the animal is exposed to cold and wet 

 while suffering from these diseases. It is caused 

 by direct irritation, such as medicinal liquids and 

 gases which find their way into the bronchial 

 tubes and thence into the tissue; from wounds or 

 portions of fractured ribs penetrating the sub- 

 stance of the lungs; it is also the result of foul air 

 and is sometimes caused from the so-called epizoo- 

 tic inlluences or agents and from pulmonary con- 

 gestion. 



Symptoms: Pneumonia is' usually ushered in 

 by a chill, followed by fever, difficult short breath- 

 ing, cough and, if the animal is forced to move, will 

 show signs of pain and in some cases will squeal. 

 Occasionally the symptoms of the disease are pre- 

 ceded by general uneasiness, dulness, loss of ap- 

 petite, and more or less fever, when, as the disease 

 advances, the pulse will increase in frequency and 

 will often reach from one hundred and twenty to 

 one hundred and fifty per minute. The cough is 

 often very troublesome, dry at first, but as the dis- 

 ease goes on it will become softer. It is a cough 

 which brings no relief to the animal ; but when the 

 mucus begins to form and the animal can bring 

 some up it then gets relief. About this period if 

 the fever abates the animal moves about and takes 



