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inside of the walls of the chest, studded all over with small tubercular 

 nodules, either grouped together or continuous. The animal may 

 possibly have been doing well up to the time it was noticed to be 

 severely ill — in fact it may be quite fat. These cases, on their com- 

 mencement, exhibit all the symptoms of pleuro-pneumonia, and it 

 may onl}' be through the post-movtem examination that the true state 

 of affairs is found. In an acute case the only difference in the 

 symptoms I have noticed between it and pleuro-pneumonia has been 

 (i) the history of the case, and (2) the absence of the dead sound on 

 striking or tapping the walls of the chest. 



539. In a chronic case an animal may go on feeding, thriving, and 

 doing well, and nothing may be observed until it is slaughtered, v^hen 

 masses of tubercular matter are found studded throughout the lung 

 substance, some in a fluid condition, others semi-fluid or solid, 

 and enclosed in a capsule, while others are of a cheesy consistency, or 

 of a calcareous nature. An animal affected like this, when the disease 

 is distinctly localised, I think, might be used for human food; but when 

 it shews the symptoms of tuberculosis during life, by falling off in flesh, 

 though feeding and milking ; having a bad cough, being also hide- 

 bound, and with a yellow scruffy skin, in fact, having all the symptoms 

 of a " piner," the sooner it is either buried or cremated the better. 



540. Tuberculosis is due to the tnbei'ciilai' bacilli, and is said to be 

 infectious by inhalation, ingestion, and inoculation. It may be so where 

 animals have a hereditary tendency to it, or have cohabited for 

 some length of time with others thoroughly diseased. Looking 

 backwards for a number of years, I can call to mind one particular 

 bull, whose stock — sons, grandsons, and great-grandsons, &c., have 

 introduced the disease amongst herds where formerly it was never 

 known. Even up to the present day I can put my finger on some of 

 this bull's diseased descendants. This is not an isolated case, for 

 within my own experience I could give many similar illustrations. 

 Strange to say, the malady rarely shews its appearance until the 

 animals are coming to puberty (two years old.) The same seems to 

 hold good in the human subject. When there are two closely related 



