THE LUXG PLAGUE. 31 



Two of these animals died after nine days illness. The other two were quite conva 

 lescent in twenty-eight and thirty-five days respectively. The three other animals con 

 tinued to cough for some months without manifesting more serious symptoms. 



The conclusions drawn by the French commissioners from the foregoing experiments 

 were as follows : 



The epizootic pleuropneumonia of cattle is susceptible of transmission from sick to 

 healthy animals by cohabitation. 



Twenty per cent, of the animals manifest a resistance to the contagion. 



Eighty per cent, manifest various effects of the contagious influence. 



Fifty per cent, are seized with decided symptoms of pleuropneumonia, and of these 

 fifteen per cent, succumb, and thirty-five per cent, recover. 



Immediate contact is not necessary for the transmission of the disease, and the first 

 affected were among the farthest removed from the sick. 



A better idea of the results of the very important experiments thus related may be 

 formed by the subjoined tables, which show at a glance the conditions under which the 

 disease was propagated. I have enlarged the French tables, and included all the data of 

 importance. 



SECOND SERIES OF EXPERIMENTS. 



The second series of experiments was instituted with a view to learn whether tho 

 animals that had been once affected enjoyed an immunity against further attacks, and 

 whether those that had resisted the disease were susceptible of subsequent infection. 



On the 5 th of March, 1852, there were placed in the stable on the farm of Charen- 

 tonneau 



First. Five cows from Pomerage, viz : Bring&amp;lt;5, (No. 10,) from stable B, which had 

 resisted the disease ; Kettley, (No. 17,) ditto ; Clara, (No. 1,) from stable A, which first 

 showed signs of pleuropneumonia on the 21st of December, 1851 ; Norma, (No. 2,) from 

 the same stable, affected the 23d of December ; La Coquette, ditto, date of attack 21st of 

 January, 1852. 



Second. With these five cows were placed two perfectly healthy animals, (Marion, 

 No. 7, and Zula, No. 8.) 



Third. Lastly, six cows, (Rose de Mai, No. 1, Mille Fleurs, No. 4, Jacqueline, No. 3, 

 Blanchette, No. 8, Rosette, No. 3, and Bucheronne, No. 5,) inoculated with blood, nasal 

 discharge, and fecal fluids, were also submitted to the influence of cohabitation. 



On the 21st of January, 1852, two sick cows were placed in this stable. One of these 

 cows was left eighteen days in the stable, and then killed to serve for the purpose of inoc 

 ulation experiments. On the 27th of June another sick cow was placed in the same stable. 



The result was that the five animals from Pomerage resisted the disease as well as 

 one of the healthy ones. The second healthy cow was seized with the malady thirty-five 

 days after cohabitation. 



In order to confirm these results, the commissioners caused to be placed in stable A 

 all that remained of the first herd. On the Gth of July, 1852, five cows were sent from 

 Paris to Pomerage. Not one of the animals that had served in previous experiments 

 contracted the disease. 



The history of pleuropnenmonia, coupled with the observations made on the supposed 



