SECRETARY'S REPORT. 83 



Eight weeks, it would seem, ought to cover its period of incu- 

 bation and propagation. Twelve Aveeks would probably be safer 

 to act upon. But not being informed upon the subject, we 

 cannot give a positive opinion. There is but one case, (as far as 

 we have read,) on record, foreign or domestic, in which it was 

 communicated during convalescence, and here the animal 

 drooled, and did not appear entirely Avell. 



THE SYMPTOMS. 



The symptoms of the disease are such as we meet in pleuro- 

 pneumonia in general. Hair rough and staring, frequent shiv- 

 ering, cough, grunting, and other indications of pain, quick 

 I)ulsc, sometimes drooling, and more or less dyspnea, accord- 

 ing to the extent of the disease and the existence of effusion in 

 the pleural cavities. Death seems to be produced, not so much 

 by the nature as the extent of the disease. Every animal, as 

 far as we can learn, that has died, or was so near death as to be 

 killed to prevent hopeless suffering, had disease of both lungs, 

 and serum in both chests. In the late stages of the disease 

 some of the animals had a copious watery diarrhoBa ; others, we 

 have been informed, were constipated. But it must be borne 

 in mind that some animals whose lungs are quite extensively 

 affected, give it to others without ever appearing ill themselves. 

 That was the case with the cow Princess, in Mr. Chenery's 

 herd. The cow Victoria had breathed badly, and showed 

 other signs of ill-health. She was slaughtered October 16, 1860, 

 and examined by Drs. Martin, Ellis, and Stickney. 



In the right side of the chest were two enlarged glands ; both 

 were filled with yellow caseous matter. The right lung con- 

 tained many small nodules, composed of the same yellow case- 

 ous material. The posterior lobe of the left lung contained a 

 similar mass as large as two fists, and others of smaller size. 

 It was supposed that this animal had never been exposed to the 

 disease, as she had only come in contact with a healthy bull at 

 the farm. But on inquiry, we learned that the cow Princess, 

 as she appeared well, had been taken down to Mr. Chenery's 

 home barn, and had stood for a long time beside Victoria. 

 This cow Princess had shown no signs of illness, except a slight 

 cough. To throw light on the subject, she was killed and 

 examined by Drs. Martin, Ellis, and Stickney, October 16, 1860. 



