A NATIONAL VETERINARY POLICE SYSTEil. 371 



on the part of the deiiler to traffic in unheahhy animals is prevented. 



This course proves a positive protection to the purchaser, as 

 well as requiring the dealer to traffic only in healthy stock and 

 secure biin a good reputation, however much lie may desire other- 

 wise. All cattle leaving infected j)laces must be accompanied by 

 a permit which admits of their being taken only to places of 

 slaughter, where, under the supervision of an inspector, they arc 

 destroyed, and a proper disposition made of the carcasses. 



lie Inspection. — When cattle have assumed a risk, but not act- 

 ually presenting s}nnptoms of the malady, and while awaiting its 

 incubation, it has always been the custom, in this as well as in 

 European countries, to practice occision ; but, believing that pro- 

 ceediug to be an expensive experiment, we have adopted the rule 

 of allowing the animals to remain in provisional quarantine ; and 

 from time to time making reinspcctions, by which means we are 

 able to keep the stable under surveillance during the incubative 

 period, when, if the disease does not appear, the quarantine is raised 

 and the stock declared healthy. This manner of proceeding being 

 a departure from the rule adopted in European countries, is looked 

 upon with disfavor by foreign veterinarians, notwithstanding expe- 

 rience has taught us that it has been productive of a great saving to 

 this State, Several stables, containing a number of cattle, were 

 during the spring months quarantined in consequence of finding 

 one or more diseased animals in them, which were removed and de- 

 stroyed, and the stables subjected to an occasional reinspeetion until 

 six months had elapsed, when, no further disease being manifest, 

 the quarantine was raised and the premises declared free from all 

 contagious disease. After carefully computing the cost of conduct- 

 ing these reinspcctions, and couqxiring it with the necessary expense 

 following the destruction of the cattle, there is a handsome balance 

 in favor of the former method. 



Miatahn Theories. — Nine months' constant intercourse with 

 "epizootic contagious pleuro-pneumonia" has established the fact 

 that many erroneous ideas have been allowed to creep into the 

 minds of the people in regard to the nature, character, means of 

 ]irevention, etc., of the malady, and foremost among them is inocic- 

 hition. 



A so-called preventive means of avoiding the spread of the mal- 

 ady is practiced with varying success. The following are the views 

 of two eminent authorities on the subject. 



Professor Liautard, Dean of the American Veterinary College, 

 says : 



