EXPERIMENTAL PRODUCTION OF TUBERCULOSIS IN PARROTS. 



569 



showed a kind of horny covering, which could easily be removed. 

 Microscopic examination of a fragment of morbid tissue revealed 

 numerous bacilli. By the ist October the lesion had extended to the 

 root of the beak and upper part of the neck. On either side it over- 

 lapped the eyes, which were covered by the vegetations developed 

 around them (Fig. 81). 



The loss of condition and increasing dyspncea caused us to suspect 

 visceral extension of the disease. Unfortunately during the night be- 

 tween the 2oth and 21st October this bird was partly eaten by rats, so 

 that no complete autopsy could be made. The results obtained, how- 

 ever, sufficiently showed that mammalian tuberculosis may in the 

 parrot produce cutaneous lesions identical with those which occur 

 spontaneously. 



Experiment 2. On the loth Aucrnst, 1894, a green parrot was ino- 



FlG. 82. 



■culated like the preceding, and in October and November was similarly 

 re-inoculated. In December the feathers were shed from around the 

 point of inoculation, and the skin became thickened and wrinkled; 

 gradually the lesions extended to the neck, beak, and claws ; around 

 the mandibles a kind of sheath developed, particularly marked towards 

 the upper parts. The vegetations on the eyelids almost entirely 

 covered the eyes (Fig. 82). The parrot ditd on the 28th September, 

 i8g6. On post-niurtcin examination no visceral lesions were discovered. 

 Experiment 3. On the 17th March, 1895, a parrot was inoculated 



