PATHOGITOMONIC SYMPTOMS. 135 



Spasm of tb9 Larynx is frequently a sequence to Laryngitis ; 

 sometimes it occurs as a primary affection. The attack 

 frequently manifests itself suddenly, and sometimes gradually. 



The symptoms of the disease are, when the attack is violent : 

 the pulse is weak and tremulous ; the eyeballs have a wild, 

 staring, haggard look ; the surface of the body is hot, and 

 covered with an abundant and steaming perspiration ; the 

 motions of the animal are uncertain and turbulent ; the 

 breathing is violent and difficult, and as the closure or spasm 

 of the larynx increases, the violence of the respiratory act 

 becomes more vehement and alarming. The breathing is 

 attended with a harsh, rasping sound ; sometimes it is closely 

 similar to the noise elicited by sawing wood, and sometimes it 

 becomes sharp and shrill, like the sound of a trumpet. The 

 affection is remittent, and not unfrequently the attack will 

 commence with the rasping noise, and gradually increase in 

 severity, until the shrill trumpet sound is heard, when the 

 violence either remains stationary for some time, and afterwards 

 subsides ; or, should it increase in severity, and relief be not 

 promply afforded, the patient will die of suffocation. 



If we analyze the above symptoms, we find some which are 

 common to a number of diseases and states of the organism, 

 and some peculiar to the disease in question. A iceah and 

 tremulous pulse is present in Epidemic Catarrh, Typhoid 

 Pneumonia, and other diseases. TTie surface of the hody hot, 

 and covered loith an abundant and steaming perspiration — This 

 is a state of the skin common to the animal in health immedi- 

 ately after having undergone severe exertion, and very likely 

 has been observed hundreds of times by every individual 

 conversant with horses. Breathing violent and difficult — These 

 are symptoms which are present in broken wind, temporary 

 spasm of the air cells of the lungs, inflammation of the lungs, 



