angement by which foreign
substances are removed may be deranged, it may be wanting in some place
or its functionary qualifications may be bad; especially frequent this
is the case after enfeebling diseases, which are associated with severe
cough, as measles, whooping-cough, etc. This is the reason why pulmonary
consumption is strikingly often observed to follow just these diseases.

But the tubercle-bacillus can also enter the body with the food, as
stated before. The acid gastric juice is a protective agent which
considerably lessens the danger of infection by tuberculosis.

It has not been definitely decided at the present time whether the
drinking of milk from tuberculous cows brings with it the danger of
tuberculosis for mankind. It will certainly be best to avoid such milk,
especially when the cow's udder is found to be tuberculously diseased or
when tubercle-bacilli can be traced in the milk.

The use of meat as food may also become dangerous to man, but this is a
rare occurrence. It is particularly dangerous to eat the liver, kidneys
and lymphatic glands of tuberculous animals. The boiling heat while
cooking generally destroys the bacilli contained therein and so lessens
the danger from this source. It is of no little importance, to call
particular attention to the fact that our chickens are very often
severely infected with tuberculosis.

The question, whether a consumptive can _infect his surroundings_, may
be answered thus, that this does _not_ happen as a rule. Several unhappy
circumstances must come together to make this possible. Above all things
a direct transmission of tubercle-bacilli in some way into the body of
the healthy person, then the bacilli must cling and propagate in the
same, which is only possible when there is an inclination to this
disease, of course this inclination is quite common.

Pulmonary consumption is _not hereditary_ in the strict sense of the
word. Only an inclination to this disease is transmitted. As the danger
of contagion of those having such disposition is very great, so as a
rule the disease makes its appearance sooner or later.

On the other hand it must be considered that the penetration _only_ of
the tubercle-bacilli into the body is _not_ sufficient to generate
tuberculosis. If they do not find the ground adapted to their
nourishment and propagation they perish. It may be assumed that every
person is placed in such circumstances at some time that he will take in
t