given. Finally, the number of
apparent errors of the tuberculin test will be greatly diminished if a
careful post-mortem examination is made, giving especial attention to the
lymph glands. This low percentage of failures being the case, cattle owners
should welcome the tuberculin test, not only for their own interest but for
the welfare of the public as well. Where this method of diagnosing the
disease has been adopted tuberculosis is gradually being eradicated.
Without its use the disease can not be controlled and the owner is
confronted with serious and continuous losses; with its use the disease can
be eradicated from the herd, a clean herd established in a few years
without very serious loss or hardship, and the danger of its spread to man
removed. Tuberculin may therefore be considered a most beneficial discovery
for the stock raiser.

Law has clearly stated the question when he says--

Many stock owners still entertain an ignorant and unwarranted dread of
the tuberculin test. It is true that when recklessly used by ignorant and
careless people it may be made a root of evil, yet as employed by the
intelligent and careful expert it is not only perfectly safe, but it is
the only known means of ascertaining approximately the actual number
affected in a given herd. In most infected herds living under what are in
other respects good hygienic conditions two-thirds or three-fourths are
not to be detected without its aid, so that in clearing a herd from
tuberculosis and placing both herd and products above suspicion the test
becomes essential. * * * In skilled hands the tuberculin test will show
at least nine-tenths of all cases of tuberculosis when other methods of
diagnosis will not detect one-tenth.

Probably the most popular objection to tuberculin is that it is too
searching, since it discovers cases in which the lesions are small and
obscure. While this fact is admitted, it should also be remembered that
such a small lesion to-day may break down and become widely disseminated in
a relatively short period. Therefore any cow affected with tuberculosis,
even to a slight degree, must be considered as dangerous not only to the
other animals in the herd but also to the consumer of her products.

In 1898 Bang, of Copenhagen, one of the highest European authorities, in
his paper presented to the Congress for the Study of Human and Animal
Tuberculosis, at Paris, said:

Numerous tests made in almo