218 CAUSES OF GLANDERS. 



and infection, in its strict sense, is the cause of acute glanders at 

 least*." 



THE EXCITING CAUSES of glanders, many and various 

 though they be, admit of distribution into five classes : — 



The First Class comprises such as come under the head of 

 contagion. 



The Second Class includes those causes that come under the 

 denomination of infection : the principal — perhaps the only one — 

 being the miasm of the stable. 



The Third Class comprehends all such causes of a common 

 kind as, acting on the animal's constitution in an ordinary or 

 healthy condition, produce ordinary effects, but which operating 

 against morbid or vitiated states of body, produce malignant 

 disease, such as glanders, farcy, &c. 



The Fourth Class is devoted to the consideration of causes, 

 still of an ordinary nature, but which in consequence of their ope- 

 ration being intensely severe or subitaneous, have been said to 

 be followed by glanders and farcy. 



The Fifth Class embraces those diseases — of the air-jjas- 

 sages and lungs especially — of which glanders and farcy is known 

 under certain states and circumstances to be the occasional 

 sequel. 



CONTAGION. 



I have placed contagion in the first or highest class of causes, not 

 because I regard it either as the most frequent or the most import- 

 ant of causations ; but because I think the early consideration of it 

 may cast a light on some of the other causes to be afterwards 

 inquired into, in particular on those included under the head of the 

 7niasm of the stable. 



Between infection and contagion, according to the late 

 Dr. Hoopert, " there does not appear to be any distinction 

 made :" according to Dr. Copland]:, such distinctions as have been 



* CTutlinos of the Veterinary Art, fifth edition, 1841. 



I In his "Medical Dictionary" — Article "Contagion." 



J In his " Dictionary of Practical Medicine " — Article "Infection." 



