2 28 CLINICAL VETERINARY MEDICINE AND SURGERY. 



tion we found very few bacilli, whether the rubbings or sections were 

 treated by Ehrlich's, ZiehPs, or Kiihne's methods. In this form, and 

 in the preceding, the two pulmonary lobes may weigh as much as 

 eighty-eight pounds or even more. 



Finally the lung sometimes exhibits lesions which to the naked eye 

 resemble sarcomata. Here are sections of lung from a twelve-year-old 

 horse slaughtered during the surgical exercises, in which you may 

 observe this form of lesion. Both lungs were at points bosselated, 

 and quite deformed by spherical tumours, developed more especially 

 towards their upper border. Five of these, three in the right and two 

 in the left lobe, were as large as a man's fist, appearing externally as 

 large hemispherical projections. Regularly rounded in outline and 

 easily separable from the surrounding tissues, these swellings were 

 built up of little globular masses, pale grey or slightly yellowish on 

 section, with a few softened centres. At points, and especially towards 

 the periphery of the lung, these growths were separated by bands or 

 tracts of whitish fibrous tissue, denser and firmer than the substance 

 of the lobules. The growths were surrounded by a thin fibrous layer ; 

 their surroundings showed no signs of acute inflammation, or sclerosis, 

 the pulmonary tissue immediately encircling them being of normal 

 appearance, except at a few points where tubercles varying in size 

 between a hemp-seed and a small nut were found. One, however, was 

 surrounded by a layer of pulmonary tissue, between | and f of an 

 inch thick, infiltrated with granules. Of these medium and small- 

 sized masses some showed the same microscopic appearances as the 

 preceding, others were dotted with yellowish points indicating softened 

 granules, while still others were marked with little brownish, irregular 

 spots ; all were remarkably rich in giant-cells, but scarcely contained 

 more bacilli than the larger growths. Bacilli, in fact, were only found 

 in a proportion of the sections. 



The tracheo-bronchial lymphatic glands sometimes form very large, 

 •dense, firm swellings of uniform fibrous consistence, or softened, 

 caseous, or partially calcified growths, embracing the terminal portion 

 of the trachea and neighbourhood of the bronchi. In exceptional 

 instances such lesions may be found at the post-mortem of animals with 

 healthy lungs. Nielsen has related a curious case of this nature. 



Tuberculosis of serous membranes is less common than in the ox. 

 It exhibits the same naked-eye appearances and very nearly the same 

 microscopic characters as in the bovine species ; sometimes granules 

 and tubercles are found in large numbers with or without a greyish or 



