EPITOME OF EVIDENCE ON PLEURO-PNEUMONIA. 283 



whole stock, both of the diseased and healthy animals ; but I 

 have found that inoculation is quite as certain to exterminate 

 the disease as the process of stamping out. On condition that 

 it is done with good virus, and on healthy animals, there is no 

 difficulty. Those animals that are not perfectly healthy will 

 prove themselves to be diseased within three weeks after 

 they are inoculated. They develop the disease. You may get 

 concurrently the development of the inoculation with the 

 development of the disease. If you get an encysted or diseased 

 lung, kill the animal. There is a little difficulty, sometimes at 

 first, in detecting the disease, or a small encystment, because you 

 cannot get close to the lungs, seeing that there is a considerable 

 amount of flesh, bones, and hair between the ear and the diseased 

 structures. A small encapsaled area might escape notice. In 

 an encapsuled case I would not expect that the inoculation 

 would take the same effect. Early inoculation entirely 'pre- 

 cludes the chance of encystment of the lungs. But if the disease 

 be present it will develop itself in a very short time after ino- 

 culation. I would not recommend inoculation of calves over 

 the whole country, but I would strongly recommend it at any 

 place where disease had already broken out. Indeed, for general 

 inoculation there would be a difficulty in getting good matter to 

 inoculate with, except when there was a fresh outbreak. The 

 matter will keep good for about three days at the outside. If it 

 is not fresh and good you should not inoculate with it. We do 

 not want any lymph sealed up to keep for any length of time ; 

 we should only use it in fresh outbreaks when it is necessary. 

 I would do my utmost to find out if the animal had an 

 encysted lung. If I could not find that out I could not help 

 it, and it would not matter, as no harm could ensue. That 

 is an objection which is raised against inoculation, but there 

 is more made of it than there is occasion for. Encystment can 

 only occur if the animals be allowed to live on without inocula- 

 tion after the outbreak of the disease, so that instead of this 

 being an argument against the practice, it ought, if properly 

 understood, to be the strongest of all arguments in its favour. 

 Inoculation in the hands of one man is one thing, and inocula- 

 tion in the hands of another man is another thing. I would 

 inoculate every one of the animals on the infected place. I 

 would unhesitatingly inoculate animals six months old or even 

 less. I do not think there is the slightest danger in selling 

 inoculated animals. I believe the danger is a great deal more 

 talk than reality. There is infinitely less danger in selling 

 animals that have been inoculated, than there is in selling out a 

 stock that have had the disease amongst them, after the expiry of 

 the statutory period of fifty-six days. It is in cases of the latter 

 kind that the disease is spread by mild cases that have ended 



