New YorK AGRICULTURAL EXPERIMENT STATION. 55 
In considering the slight progress which had been made by the 
disease in the case of some of these cows it should be remembered 
that they were what had been left by a process of selection from 
the entire herd of nineteen animals. 
Millie D. was in such poor condition as to have little beef value. 
She was killed and carefully examined December 12. Her poor 
physical condition was evidently due to causes incident to old age 
as a very complete examination showed only small tubercles (about 
the size of a small pea), evidently well encapsulated, in three of 
the tracheal and mediastinal lymphatic glands. It should be re- 
membered that this cow had not reacted for three years so that 
the age of the lesions can be very closely determined. Although 
these hard and sharply circumscribed lesions gave every appearance 
of dead tissue, a Guinea pig was inoculated subcutaneously with 
three of these little tubercles. It died in six weeks with generalized 
tuberculosis. This observation is important in that it shows how 
long these bacteria may remain alive in the encapsulated tubercles. 
