DISEASES OF CATTLE. (59 



In the mean time every attention was given to the feeding and 

 general care of the cattle upon the place. 



In 1S51 I again found two of the cattle that coughed, and grad- 

 ually became somewhat emaciated. The attempt to fatten them 

 was partially successful in one, but failed in the other. Both were 

 killed, and tuberculosis found in them. Four calves were placed in 

 the spring of 1S52 with the cattle in the old stable, and four others 

 placed where they were taken from. All seemed to be healthy to 

 the spring of 1854, when one of the calves, which had become three 

 years old and had been placed in the old stable, began to cough. 

 The cough was at first very slight, but commenced to increase after 

 the heifer had calved. In the following summer it again dimin- 

 ished, to augment very considerably in the fall. This animal was 

 put out to graze in the spring of 1855, and to my surprise became 

 quite fat ; but upon being slaughtered the animal was found to be 

 highly tuberculous. 



Of the old cattle there still remained a single cow, which we 

 will call " A," that had always stood next to the above-mentioned 

 animal. All the others had been sold and killed, their places hav- 

 ing been filled by new ones. This cow had coughed for a long 

 time ; but, not suffering in condition, she had been kept, as she was 

 a great favorite with the farmer's wife, especially as I had not then 

 the slightest suspicion of infection by means of the atmosphere. 

 Every animal which during this period had stood beside this cow 

 had begun to cough after a shorter or longer period, and, as the 

 positions of the animals were sometimes changed, it happened that 

 in course of time nearly all of them began to have the same sus- 

 picious cough. 



The continued buying, rearing, and selling of cattle went on for 

 nine years before I had opportunity to examine the cow "A," 

 which was then sold to a butcher. The examination of the body 

 and its contents resulted in finding it highly tuberculous. The re- 

 sult of all my experience awakened in me the suspicion of the 

 transmission of the disease from animal to animal, an opinion which 

 was then considered ridiculous. I communicated my opinion to the 

 owner, and advised his selling off all his cattle and replacing them 

 with new and healthy ones from parents and places where the dis- 

 ease was not known to exist. My advice was appreciated by the 

 owner calling in a quack to take my place. 



Case II. — On another farm were kept from twenty-four to 

 twenty-six head of cattle. In 1864 the owner bought a calf to bring 

 up, the mother of which died a few years later from tuberculosis. 



