236 CLINICAL VETERINARY INffiDICINE AND SURGERY. 



I have often mentioned canine tuberculosis, its different forms, 

 the symptoms which it produces, and the pecuHarities seen in certain 

 patients. Furthermore, I have shown you that the disease may easily 

 be mistaken even on post-mortem examination. As this morning 

 occasion has again arisen for speaking of the disease, I will cast a rapid 

 glance over the cases I have collected, and briefly describe some which 

 deserve remembrance. 



Before Villemin published his experiments, the existence of tubercu- 

 losis in the dog, though described by some authors, was still contested 

 by most. The discovery that the disease was inoculable, and the later 

 identification of the bacillus which produced it, showed that the dog 

 was subject to tuberculosis, and allowed of distinguishing this infection 

 from other morbid processes anatomically characterised by lesions of a 

 tubercle-like character. 



During a further period of nearly ten years — until 1891 — -canine 

 tuberculosis was usually regarded as exceptionally rare. This opinion 

 was founded on the few cases published in France and abroad previous 

 to the latter date, despite the new power of confirming diagnosis, 

 either during the patient's life or after death. 



During i8gi I turned my attention to this form of tuberculosis. 1 

 looked for it at Alfort in patients in my own portion of the hospital 

 and among those brought for consultation. I was soon convinced that 

 it could not be considered rare, and that the reason for its continuing 

 to be so regarded was because observers failed to differentiate it, 

 because its pulmonary localisations were mistaken for chronic pneu- 

 monia, and its other lesions — especially those in the liver, serous mem- 

 branes, and lymphatic glands — for cancer. 



In 1893 I had collected statistics of forty cases. These sufficed for 

 a description of the principal forms of the infection, its localisations, 

 and its anatomical and pathological characters.* 



Pursuing my researches on the patients brought to the outer clinique, 

 and assisted by students who followed them up in the surgical hospital, 

 I was able to collect 165 new cases in which diagnosis was verified by 

 post-mortem examination. 



In the dog the localisations of tuberculosis are as varied as in other 

 species. Sometimes lesions are rare, limited to a few organs, or even 

 to only one ; much more frequently they are found in the majority of 

 the viscera and lymphatic glands, and with a fair degree of frequency 

 in the pleura and peritoneum. In the 205 cases at present collected 

 the thoracic and abdominal viscera have been invaded in 140 cases, in 



* Cadiot, ' La Tuberculose du Chien,' Paris, 1893. 



