40 DEPARTMENT OF AGRICULTURE. 



AVcll-iiiarked symptoms of plciiro-piieumonia presented themselves on 

 four cows, ill the follow in <;• order: 



First, La Garde, (No. L'O,) sixteen days after first contact. 



Second, Leduc, (No. IS,) thirty days after tirst contact. 



Third, INIarton, (No. 5,) thirty-live days after first contact. 



Fourth, Uomard, (No. 14,) forty days after tirst contact. 



Two of these animals died after nine days' illness. The other two 

 were quite convalescent in twenty-eight and thirty-five days respectively. 

 The three other animals continued to cough for some months without 

 manifesting more serious symptoms. 



The conclusions drawn by the French commissioners from the forego- 

 ing experiments were as follows: 



The epizootic pleuro-pneumonia 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 pleuro-pneumonia, 

 and of these fifteen ])er cent, succumb, and thirty-five per cent, recover. 



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

 and tbe first affected were among the furthest removed from the sick. 



A better idea of the results of the very important experiments thus 

 related may be formed by the subjoined tables, wlijch 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 EXPEREMENTS. 



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

 whether the 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 5th of March, 1852, there were placed in a stable on the farm 

 of Charentonneau — 



1st. Five cows from Pomerage, viz: Brhig(?, (No. 10,) from stable B, 

 which had resisted the disease; Kettlej^, (No. 17,) ditto; Clara, (No. 1,) 

 from stable A, which first showed signs of pleuro-i)neumonia on the 21st 

 of Beceiuber, 1851; Norma, (No. 2,) from the same stable, affected the 

 23d of IJecember; La Coquette, ditto, date of attack 21st of Januarv, 

 1852. 



2d. With these five cows were placed two perfectly healthy animals, 

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



3d. Lastly, six cows, (liose de Mai, No. 1, Mille Fleurs, No. 4, Jacque- 

 line, No. 3, Blanchctte, No. 8, Eosette, No. 3, and Bucheronne, No. 5,) 

 iiiocidatcd widi blood, nasal discliaigc, and fo'cal fluids, were also sub- 

 mitted to the influence of cohabitation. 



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



