EXTERNAL TUBERCULOSIS IN THE DOG AN!) CAT. 105 



Its base was greyish, fairly level, and presented the general appearance 

 of an ulcerated cancer. Yellowish granulations, however, appeared at 

 points ; and around its outer edge, beneath the separated skin, caseous 

 material could be seen. Greyish pus ran from the nostrils, which were 

 soiled and covered with crusts. Both submaxillar)- lymphatic glands 

 were slightl}- enlarged. The lesion was, therefore, of tuberculous 

 character, and ver}- virulent. The nasal discharge, pus, and caseous 

 material from the wound contained considerable numbers of bacilli. 



On post-nwrtcm examination we found disease of the precaecal 

 mesenteric glands, which were as large as a hazel nut, hard, gritty on 

 section, and showed caseous, and even chalky, points. The liver also 

 presented some tubercles. The lungs contained numerous caseous 

 centres ; the tracheo-bronchial, retro-pharyngeal, and submaxillary 

 glands were diseased. 



The ulcer on the nose had not only destroyed the soft tissues, but 

 had invaded the subjacent bone, which was soft and friable, eroded in 

 places, and infiltrated with caseous material. The upper wall of the 

 nasal cavities was, however, only pierced at one point, between the 

 nasal and superior maxillary bones, midway between the eye and base 

 of the nose, whence communication existed with the left nasal cavity 

 by an orifice which had escaped notice during life. For a distance of 

 about three eighths of an inch around the ulcer, the skin and sub- 

 cutaneous connective tissue showed on section yellowish points de- 

 noting softened tubercles. In the thickness of the end of the nose 

 similar lesions ^^■ere found. Close to the perforation, and particularly 

 over the turbinated bones, the pituitary membrane was thickened, 

 ulcerated in places, and covered with fine tuberculous granules ; thick- 

 ening of the mucous membrane was specially marked towards the 

 opening of the nostrils, which it partially blocked. 



Ulceration of the tissues of the nose was probably secondary ; a 

 centre having first formed on the pituitary membrane, extended to the 

 turbinated bones, thence to the lower portion of the nasal bones, and 

 lastly to the skin. The process would be favoured by rubbing or 

 scratching the parts. It is also possible that the skin may have been 

 directly inoculated by the action of the paws. 



