more injurious than mineral dust. Workmen, that are
exposed to animal dust, as furriers, saddlers, brushmakers, fall prey to
consumption much oftener than those, that fulfill their vocation in air
pregnant with vegetable dust. According to statistics workingmen are
stricken with pulmonary consumption as follows: of glass workers 80 per
cent., needle grinders 70, filemakers 62, stone cutters 40, mill
grinders, lithographers, cigarmakers, brushmakers, stone-polishers
40-50, millers 10, coal workers 1 per cent.

Pneumonia may culminate in pulmonary consumption: but on the whole this
rarely happens. Much oftener it is the case with Pleurisy. But it is
assumed and rightly, that most people who are attacked by pleurisy, are
already consumptive.

A hemorrhage of the lungs may nearly always be considered a sure sign
that consumption has taken hold of the respective individual; but such a
hemorrhage certainly forms considerable danger to falling a victim to
tuberculosis, if the individual is as yet free from the same.

Age has a particularly decided influence on the origin of consumption;
it is extremely rare before the third or fourth year, from that to the
seventh it is more frequent; it most frequently occurs in the age from
the fifteenth to the thirtieth year, and from there on the chances are
again fewer. In very old age it is again very rare.

There seems to be no essential difference as regards sex.

_Insufficient_ or _defective nourishment_ acts as a promoter in various
ways. Even the nourishing of infants with poor milk, with bread or
flour-pap increases the disposition to pulmonary consumption. If this
defective nourishment is continued, scrofula will surely follow and this
is a stage antecedent to consumption.

Pulmonary consumption is relatively more frequent among the _poorer_
than the _well to do people_, this is partly due to the meagre and
scanty food of the poorer, and that they are obliged to subsist almost
exclusively on vegetable diet. The higher the meat prices rise and the
less the majority of the people can afford to procure meat, the larger
will be the number of consumptives. The poorly nourished offer a good
soil for the tubercle bacilli in consequence of their weakness. The
tissue offers little or no resistance to the growth of the bacilli,
these propagate and destroy the powerless and yielding organism with
fearful rapidity.

The _frequency_ of pulmonary consumption increases with the _size of t