to the system will certainly manifest in some form of disease, either
in a form of blood disease or some disease resulting from impaired
functioning of some insufficiently nourished organ or tissue.

The blood, when properly exposed to the air in the lungs, not only has
its impurities consumed, and parts with its noxious carbonic acid gas,
but it also takes up and absorbs a certain quantity of oxygen which it
carries to all parts of the body, where it is needed in order that
Nature may perform her processes properly. When the oxygen comes in
contact with the blood, it unites with the hemoglobin of the blood and
is carried to every cell, tissue, muscle and organ, which it
invigorates and strengthens, replacing the worn out cells and tissue
by new materials which Nature converts to her use. Arterial blood,
properly exposed to the air, contains about 25 per cent of free
oxygen.

Not only is every part vitalized by the oxygen, but the act of
digestion depends materially upon a certain amount of oxygenation of
the food, and this can be accomplished only by the oxygen in the blood
coming in contact with the food and producing a certain form of
combustion. It is therefore necessary that a proper supply of oxygen
be taken through the lungs. This accounts for the fact that weak lungs
and poor digestion are so often found together. To grasp the full
significance of this statement, one must remember that the entire body
receives nourishment from the food assimilated, and that imperfect
assimilation always means an imperfectly nourished body. Even the
lungs themselves depend upon the same source for nourishment, and if
through imperfect breathing the assimilation becomes imperfect, and
the lungs in turn become weakened, they are rendered still less able
to perform their work properly, and so in turn the body becomes