254 



tuberculosis, many of them being condemned entire as unfit 

 for food. 



Considering the large amount of tuberculosis present in the 

 herd the remaining eleven animals were naturally regarded with 

 suspicion, as there was little chance of their escaping the infec- 

 tion and one or two reactions were expected during the next two 

 or three years, the time depending of course on the progress of 

 the disease in the animal system. The second and third tests 

 passed without showing any reactions among these eleven cows, 

 which is surprising when it was almost certain that some of them 

 were infected. Owing to the excellent care and treatment which 

 these animals received their vitality was of such a high degree 

 that they were able to hold the disease in check. On this, the 

 fourth test, however, two of these cows gave unmistakable reac- 

 tions along with an imported cow and a heifer which had been 

 raised in the place. Careful post mortem examinations were per- 

 formed on all these animals, the results of which are as follows : 



Xo. 1. — 3-year-old heifer raised on the place from imported 

 California stock. Reaction: Large and typical in character. 

 Lesions : Small, recent nodules in the retro-pharyngeal and bron- 

 cho-oesophagal lymph glands. 



No. 2. — Imported short horn cow ; had passed subcutaneous 

 test on the coast and one intradermal test here a year ago. Re- 

 action : Small in size but showing all the typical characteristics. 

 Lesions : Small nodules in portal lymph glands and large abscesses 

 the size of the closed hand in the liver. The carcass was in 

 prime condition. 



Xo. 3. — Grade Hereford cow. Had been in the dairy for 

 some years and had passed three tuberculin tests, the first of 

 which was the classical subcutaneous method. Reaction: Medium 

 size and of a ty]:>ical character. Lesions : A careful examination 

 failed to reveal any tuberculous lesions in the usual seats of the 

 disease. Although 1 made a most careful examination in this 

 case and was unable to find any evidence of disease it is more 

 probable that I overlooked it than that it was not there. This 

 is the finst case out of thirty-five ]x)st mortcms in wliich I have 

 failed to locate the disease. 



Xo. 4. — Grade Holstein cow. Like the al)(nc animal it had 

 been in the dairy for a numl)er of years and had passed througli 

 the same three tests. Reaction: Large and of a diffuse cliar- 

 acter. the injected fold being at least four times as thick as the 

 opposite one. Reactions of this character although positive indi- 

 catir)!! f)f the presence of tuberculosis, arc comparatively rare. 

 Lesions: Left retro-i)haryngeal hmiih gland contained six well 

 etica])sulated norlules all nearly alike in size being nearly the dia- 

 meter f>f a dime. The connective capsule anmnd each was very 

 jirominent and completely circumscribed it. Tluse gave every 

 cviclcnce of being in a f|uicscent stage an<l had they been the only 



