y, and dependency. They should be
positive and progressive. They should include the love of a perfect
muscular development, of integrity of mental and moral fiber.

There should be a keen sense of enjoyment of all life's activities. As
William James once said, simply to live, breathe and move should be a
delight. The thoroughly healthy person is full of optimism; "he
rejoiceth like a strong man to run a race." We seldom see such
overflowing vitality except among children. When middle life is reached,
or before, our vital surplus has usually been squandered. Yet it is in
this vital surplus that the secret of personal magnetism lies. Vital
surplus should not only be safeguarded, but accumulated. It is the
balance in the savings bank of life. Our health ideals must not stop at
the avoidance of invalidism, but should aim at exuberant and exultant
health. They should savor not of valetudinarianism, but of athletic
development. Our aim should be not to see how much strain our strength
can stand, but how great we can make that strength. With such an aim we
shall, incidentally and naturally, find ourselves accomplishing more
work than if we aimed directly at the work itself. Moreover, when such
ideals are attained, work instead of turning into drudgery tends to
turn into play, and the hue of life seems to turn from dull gray to the
bright tints of well-remembered childhood. In short, our health ideals
should rise from the mere wish to keep out of a sick bed to an eagerness
to become a well-spring of energy. Only then can we realize the
intrinsic wholesomeness and beauty of human life.

CHAPTER I

AIR

Section I--Housing

Air is the first necessity of life. We may live without food for days
and without water for hours; but we cannot live without air more than a
few minutes. Our air supply is therefore of more importance than our
water or food supply, and good ventilation becomes the first rule of
hygiene.

Living and working rooms should be ventilated both before occupancy and
while occupied.

It must be remembered that the mere construction of the proper kind of
buildings does not insure ventilation. We may have model dwellings, with
ideal window-space and ventilating apparatus, but unless these are
actually used, we do not benefit thereby.

[Sidenote: Features of Ventilation]

The most important features of ventilation are motion, coolness, and the
proper degree of humidity and freshness.

[Sidenote: Draf