284 EPITOME OF EVIDENCE ON PLEURO-PNEUMONIA. 



in an encystment. The statistical part of my report to the 

 Dundee Local Authority will show the value of encystment. 

 There is far less encysting than many people who talk learnedly 

 on the subject imagine. The principal thing to do is to have 

 the inoculation put into the hands of those who can manage it. 

 There are some, I believe, who say they work at inoculation, and 

 make a muddle of it. It is not difficult; it is neither difficult to 

 teach it, nor to do it, but I am told that some peoj^le get bad 

 results. From my report you will see that out of a total of 380 

 cows inoculated, 16 were killed diseased, and 864 remained 

 healthy, and of those 16 there was only one that was really a 

 healthy animal when inoculated. The animals that became 

 diseased and had to be killed, were all previously diseased. 

 Not a single encysted case occurred among all the remainder of 

 them. 'J 'hey have mixed with other uninoculated animals ever 

 since, and not one of them has developed the disease. I say that 

 this disease sometimes lies latent for six or seven months when 

 contracted in the ordinary way. I would call this the incubative 

 stage of the disease. I know of cases that have occurred five, 

 six, and seven months after purchase, and you cannot describe 

 it in any other way than that it was in a state of incubation 

 for the seven months. The case that occurred after seven 

 months was a case that broke out among those animals 

 that were introduced. There had been no disease in that 

 stock before. The former stock had been brought up on the 

 premises. I only remember one seven months' case at present. 

 So in cases like this the fifty-six days' restrictions might be 

 extended to seven months without absolute safety. If you 

 do not go in for inoculation, fifty-six days is not enough ; 

 but if you go in for inoculation, you make the fifty-six days 

 more than enough. I would not kill every animal that would 

 not take the inoculation. I would kill all that I considered 

 suffering from the disease in every form. If there be 

 any risk- — (which I den}^, if the animals are inoculated) — 

 I would run the risk of any little chance there is of encyst- 

 ment. There is not more than one in a thousand cases if 

 inoculation be resorted to, as I have never yet met with 

 such a case. Encystment occurs much more frequently under 

 the system of killing the diseased and allowing the others to 

 remain. If you were to inoculate at once, you would absolutely 

 'prevent encystment. There is no chance of a properly inoculated 

 animal taking the disease. It does not take it in either an active 

 or passive form, but if it is already there, it develops at once. I 

 do not take a note of encystment cases, because I have not come 

 across any of them after inoculation. In the case of a b}Te 

 declared diseased quite recently there was a cow with an 

 encysted lung brought into it, and I found that that encysted 



