minute fraction of that which the lungs do.

The skin is a heat regulator, and in this, its most important work, it
is aided by the two million or more sweat-glands which are distributed
over almost the entire surface of the body. The skin and the
sweat-glands work together to keep the blood at an even temperature,
either by giving off heat or in preventing this process in case the
outside air is too cool. The body temperature, as a rule, is higher than
that of the outside air, so that heat is generally being given off by
the skin. We are perspiring constantly, but usually to such a slight
extent that the fact is hardly noticeable. The amount of heat which is
thrown off at any time is proportional to the amount of the tissue
burned up by muscular action.




CHAPTER V


Health, strength, and efficiency! Surely every man in this great
Republic of ours wants to be healthy, strong, and efficient, but how is
he to obtain and maintain this threefold blessing? It has been stated
that scientific physical exercise, preferably taken in group
association, will accomplish it. Now to consider some of the practical
details involved.


THE ORGANIZATION