STATE CONTROL OF TUBERCULOSIS. 
465 
of cattle slaughtered on the evidence furnished by tnberenlin 
whieh are in the earliest stages of the disease. A small foens in 
a mediastinal gland, perhaps, or in one of the throat or messen- 
teric glands, is all that can be found. 
Pathology has informed us that traces of stationary or 
healed tnbereulosis, nnreeognized during life, are not infre¬ 
quently encountered on the post-mortem table. Are such per¬ 
sons to be placed within the class of diseased or simply infeeted ? 
I believe that an infeeted animal is not neeessarily an affected 
or diseased animal, and that no one can predict just what is go¬ 
ing to become of a primary foens, whether it will gradually 
eneroaeh upon neighboring organs or become generalized, or 
become caleified or cieatrized.” (See p. 320 Boston Med, and 
Siirg. Jottrnal^ Sept. 24, 1896.) 
Praetically the same thing was demonstrated by Pizzini, who 
has reported “ observations upon lymph glands of persons hav¬ 
ing died without showing any evidence of tuberculosis. In 12 
out of 30 cases examined microscopically and by inoculation in 
guinea pigs tnbereulosis was demonstrated, and the further fact 
shown that only those guinea pigs inoculated with bronehial 
glands showed any evidenee of disease.” {Annual of Med, 
Sciences,) 
This is further eorroborated by reported observations made 
at Johns Hopkins University and elsewhere, from the large 
number of autopsies made on people dying from eauses other 
than eonsumption that show evidenee of undiseovered or healed 
tnbereulosis. From the number of cases in whieh this occurs 
it is evident that a larger number of people have consumption 
at one time or another during life and recover, than there are 
that die from this disease. 
Such a state of affairs is significant and the only inference to 
be drawn is that tnbereulosis is far more prevalent among 
human beings than we have had any idea of, and in faet that 
practically the same conditions exist among people that have 
been found, through the use of tubereulin, to exist in eattle, 
and if tubereulin were used as a diagnostie agent among people 
