he change is made.

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681. Should the garments worn during the day be worn at night? 682.
What is said respecting the cleanliness of beds and bedding? Why
should not bed-linen that is damp be slept in? 683. When should change
of dress from thick to thin be made? Why?

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684. _When the clothing has become wet, it is best to change it
immediately._ The skin should then be rubbed with a dry crash towel,
until reaction, indicated by redness, is produced. If the garments are
not changed, the person should exercise moderately, so that sufficient
heat may continue to be generated in the system to dry the clothing
and skin without a chill. Sitting in a cool shade, or current of air,
should, by all means, be avoided; as colds are not contracted by free
and excessive exercise, but by injudicious management after such
exercise.

_Observation._ When an individual has been thrown into a profuse
perspiration by violent exercise, though the skin and clothing may
become wet, he feels no inconvenience from the dampness, as long as he
continues that amount of exercise for the reason that the circulation
of the blood being increased heat is generated in sufficient quantity
to replace the amount abstracted from the system in evaporating the
free perspiration; but as soon as the exercise is discontinued, the
increased circulation subsides, and with it the extra amount of
generated heat. This accounts for the chill we experience, when the
damp clothing is permitted to dry on the body, after the cessation of
exercise.

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684. What suggestion when the clothing has become wet? What should be
done if the garments are not changed? What causes the chill that is
experienced when damp clothing is permitted to dry on the body?

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CHAPTER XXXIV.

HYGIENE OF THE SKIN, CONTINUED.

685. Bathing, its necessity and expediency, is obvious from the
structure and the functions of the skin. The cuticle is cast off in
minute, powdery scales, many of which are retained upon the surface by
the pressure of clothing. These mingle with the oily and saline
products of the skin, and form a thin crust. This crust, on account of
its adhesiveness, collects particles of dust and soot from the
atmosphere, and particles of foreign matter from our dress; so that in
the course of the day the whole body becomes coated with impurities.
If this coating