76 The Lung Plague of Cattle. 



infected stable all these animals resisted the disease. 01 

 fifty uninoculated animals placed in the same stables, 

 seventeen became diseased. 



He further re-inoculated ten cattle that had been al- 

 ready successfully inoculated, and all the wounds healed 

 promptly without any local swelling such as marked the 

 other cases from the tenth to the thirtieth day. 



I/i none of these cases was there any indication of dis- 

 ease of the lungs, and in a number that were killed these 

 organs were found healthy. 



He concluded that when the virus is inoculated on a 

 susceptible animal, " a new disease is produced ; tlie af- 

 fection of the lungs with all its peculiar characters is lo- 

 calized in some sort on the exterior;" and that this 

 disease is preservative against all future attacks of pleu- 

 ro-pneumonia. 



Various commissions were appointed by different Eu- 

 ropean Governments to determine the matter by experi- 

 ment. The Dutch Commission composed of the Faculty 

 of the Veterinary School at Utrecht reported in 1852 

 that out of 247 head of cattle inoculated sixteen afterward 

 contracted the disease, these being mainly composed of 

 such as had the least local swelling in the seat of inocu- 

 lation. They reported that inoculation had " a power, at 

 least temporary, of securing against the contagion of 

 pleuro-pneumonia." 



The Belgian Commission, presided over by Professor 

 Verheyen, inoculated 197 cattle, fourteen of which were 

 afterward kept in stables with infected animals without 

 contracting the disease. 



The French Commission, presided over by Professor 

 Bouley, inoculated 54 cattle, of which 48 survived and 

 were made to cohabit with diseased stock. But one of 

 these contracted the plague. 



Meanwhile Dr. Willems and 54 veterinary surgeons 

 inoculated 5,301 head of cattle, of which 66 afterward 



