338 GENERAL REPORT OF THE SCIENTIFIC COMMISSION. 
6. Are those animals who have contracted for the first time, 
more susceptible of taking the disease again ? 
In order to obtain the solution of these questions, the com- 
mittee have submitted to different proofs of cohabitation, 
46 animals of the bovine breed, perfectly sound in health, 
and in such conditions of superintendence that they have 
never been exposed to the influence of contact of animals 
affected with peripneumonia. 
These 46 subjects of experiment have been disposed of 
as follows : — 
20, at Pomeraye (first experiment). 
2, at Charentonneau (second experiment). 
13, at Maisons-Alfort (third experiment). 
11, at Charentonneau (fourth experiment). 
Of this number, 
21 animals have appeared insusceptible to contagion in a first trial of co 
habitation. 
10 have manifested transient indisposition, 
15 have taken the disease. 
46 total. 
Of the 15 sick of peripneumonia contracted through co- 
habitation, 1 1 were cured, and 3 died. 
Consequently, the number of resisting animals, to ap- 
pearance, on the first trial of cohabitation, rose to . 45 ‘65 out of 100 
The animals insusceptible, to 21'73 „ 
That of animals sick and cured, at .... 23 91 „ 
That of animals dead, at . . . 8 ’69 „ 
But if, in place of reporting on the external appearances of 
animals exposed to cohabitation, we take into consideration 
the results afforded through the autopsies, which have de- 
monstrated that six out of the eleven animals placed under 
experiment at the farm of Charentonneau (4th experiment) had 
contracted the disease, we should find that we must reckon six 
animals more as falling sick after cohabitation, and six at 
least as resisting (contagion), which gives, in point of fact, the 
following results : — 
15 resisting 
10 insusceptible . 
1 7 sick cured 
4 dead 
32-61 out of 100 
2173 „ 
36-95 
46 
100-27. 
Of these, 42 animals who were exposed to the first proofs 
of cohabitation made at Pomeraye and Charentonneau, and 
which escaped with their health or recovery, 18 -were sub- 
