SUMMARY OF EVIDENCE ON PLEURO-PNEUMONIA. 293 



It is considered by many that if inoculation is to become 

 general as a protective measure it would be necessary to secure 

 an unlimited supply of pure and trustworthy lymph. 



It is believed that, by artificial cultivation, such a supply 

 might be had ; and that it might even be attenuated so as to 

 lessen risk of death from the operation of inoculation. 



It is not known whether inoculation tends to arrest the pro- 

 gress of the disease in an atfected animal, and so to increase the 

 proportion of cases of encysted pleuro-pneumonia, or whether it 

 tends to hasten and develop the progress of the disease in an 

 affected animal, and so to diminish the number of encysted cases. 



It is not known if inoculation gives an animal absolute 

 immunity from the disease, or for how long it does so. 



It is sincerely to be hoped that the policy of universal slaughter 

 at present being carried out "svill rid the country of the disease ; 

 but, lest it should be found incapable of permanently doing so, 

 or lest the cost of carrying out the policy may be too great, it 

 is most desirable that, in the meantime, every opportunity of 

 investigating the disease should be taken advantage of. 



A probable result of the investigation will be to find that many 

 of the present restrictions are unnecessary, and that the policy 

 of wholesale slaughter pure and simple is needlessly expensive, 

 and that certain modifications of the system of suppression may 

 be introduced with great economy, and with perfect efficacy. 



PLEURO-PNEUMONIA. 



REPORT BY DEPUTATION TO PRIVY COUNCIL, 18th NOVEMBER 



1887. 



At a Meeting of the Directors of the Society held on the 7th of 

 December 1887, Mr F. N. Menzies reported that, according to 

 previous arrangement, the Deputation appointed at the Board 

 Meeting on the 2nd of November, viz., Mr Stirling of Kippen- 

 davie, Mr Paterson of Birthwood, Mr Marr, Cairnbrogie, and 

 himself, waited on Viscount Cranbrook and Lord John Manners 

 at the Privy Council Office, on Friday 18th November, to lay 

 before their Lordships representations on the subject of pleuro- 

 pneumonia. There were also present Mr C. Lennox Peel, C.B., 

 Clerk of the Council, and Professor Brown of the Agricultural 

 Department. 



Mr Menzies read the Memorial adopted by the Board on the 

 2nd of November, as follows : — 



That your Memorialists, as representing the landed proprietors, 

 tenant farmers, and others in Scotland, have a very deep interest 



