frequently met with in rapidly growing girls, and it is one of the
most common causes of lateral curvature. In these cases proper
gymnastics are indicated, but they should be prescribed and carried
out with much care.

It is upon the erectness, suppleness, and strength of the spinal
column that most of the power and grace of the body depend.

Lack of ventilation is a fertile cause of headache, anemia (or an
impoverished condition of the blood in iron and oxygen), and
dyspepsia. All these are rare before but common after twelve years of
age.

Exercise.-- In physical culture the object aimed at should be the
symmetrical development of all the muscles of the body. Hence the
necessity for bringing every individual muscle into play, at first for
its development, and later for its maintenance.

The tendency of almost all forms of exercise is to develop some
portion of the body at the expense of the rest. The most perfect form
of exercise is therefore that one which will most nearly call into
play all the muscles of the body.

Walking.-- Walking is the only form of exercise which may be said to
be universal. In walking the muscles of the chest get little exercise,
and those of the spine and abdomen even less. In walking the arms
should swing easily at the sides, both from a physiological and an
esthetic point of view. If the girl is weak or is unaccustomed to take
any exercise, the guide for the amount of exercise taken at any one
time must be this: At the first sense of fatigue, stop at once and