those members of society who achieve the
least and who may be regarded as parasites.
Exercise both of brain and of muscle is necessary
for growth and for health.

Those nations which expend the most energy
are probably the ones among whom longevity
is greatest and the mortality rate the lowest.
In the city of Chicago there are many conditions
adverse to health of body and mind, yet
the city is famous for its relatively low mortality
as a parallel fact. It is also affirmed
that the average Chicago man works longer
hours and actually accomplishes more than
the average man elsewhere. This excess in the
expenditure of energy--in so far as it is
wisely spent--may be one of the reasons for
the excellent health record of the city.

In every walk of life we see that the race
is not to the swift nor the battle to the strong.
We all know men clearly of secondary ability
who nevertheless occupy high positions in

business and state. We are acquainted also
with men of excellent native endowment who
still have never risen above the ranks of mediocrity.

_Human efficiency is not measured in terms
of muscular energy nor of intellectual grasp. It