I have had the Lung disease on two farms; all known treatment is unsatisfactory. I believe, if the attack be violent, no treatment will save the animal. It is sometimes difficult to know it at first. There will generally be a cough, but it is not the clear cough of the animal in health. It is compressed, and the animal coughs unwillingly and with evident pain. The particular cough cannot be mistaken, and the grunt is a never-failing symptom. There is generally one lung more affected than the other. The ear being applied to the chest will discover the impeded circulation. Many cattle take the disease so slightly that it is never discovered. Some have little if any cough, and the pile continues soft and healthy. I recollect a milking cow which I was suspicious had the disease. I made her be run out; there was no acceleration of breathing; her coat was fine, and there was no diminution of the milk; but she gave a grunt which confirmed me in my opinion that she had had a slight touch of the complaint. The grieve, a most intelligent man, was satisfied that the cow was healthy. I fattened her, and for my own information had her slaughtered at home. It was three months after, and the _post-mortem_ examination showed one of the lungs, to the extent of about the size of a crown-piece, adhering to the ribs--a sufficient proof that my conjecture was correct. Many take the disease that are never suspected. I had a bullock showing some symptoms of the disease in a byre amongst ten. The others were, to all appearance, in perfect health. I sent them immediately to London. My salesman was instructed to inspect the carcasses after they were slaughtered, and to report. He did so carefully, and there was not one of the number but had their lungs more or less affected. Mr Collie, Ardgay, Morayshire, had a byre of cattle slaughtered under the same circumstances, and with the very same result. Pleuro-pneumonia is not so infectious as foot-and-mouth disease, but if it get into a farm-steading it is most difficult to get clear of. I have known cattle infected in three days. I had bought a lot of cattle from a farm in Morayshire where the disease has never been up to this hour. It was in the month of April. There were two or three of the lot that I did not think profitable to graze. I tied them in a byre where infected cattle had stood. They were only to be kept a week or two, and I had no idea of danger. One of them took the disease very badly in three days after he was tied up. I have known it lie dormant in the system (as to any visible appearance) for three months and a half. I found the general period of incubation from five to six weeks. I have taken the greatest pains with the byres where the infected cattle stood, having the wood-work taken out, the roofs and greeps carefully scraped and washed with soap and warm water, lime-water, and afterwards with chloride of lime; and yet, after all this labour, I have seen the disease break out again and again. After repeated outbreaks, I not only removed the wood-work, but the whole of the stones in the stalls and greeps, and buried them. I had the roofs and stone mangers, &c., carefully scraped, and washed with soap and warm water, and afterwards with chloride of lime. They were then closely painted, and lastly coal-tarred; but it was only after five or six months' perseverance that I got clear of it. Having heard a report that a cow belonging to my cousin, Mr M'Combie, editor of the 'Free Press,' was labouring under pleuro-pneumonia, I went to see her. Mr Sorely, veterinary surgeon, was in attendance. As there had been no disease in the neighbourhood for five years, I was unwilling to credit the report. But a more marked case I have never witnessed; and the _post-mortem_ examination showed all the symptoms of the fell disease. Mr Sorely, Mr M'Combie's overseer, and I, all agreed that as a wood dividing-partition had been allowed to remain since the time of the previous infection, and the cow was seen chewing pieces of the wood that had got rotted at the base, the wood had retained the poison, and the cow had been infected from the chewing of it. The breath is the cause of the infection when cattle are housed together and the disease introduced. It generally attacks the animals standing at the walls first. The breath is driven by different currents through the building to the walls, where it is stopped; it rebounds, and hence the beasts at the walls generally fall the first victims--so, at least, I have found it in my experience. I had forty beasts divided by a stone-and-lime mid-wall to the level of the side-walls; up to the roof there was a strong and close division of wood. Unfortunately there had been a small aperture about two feet square left open.