diately following menstruation. However, she should remember that a
reasonable amount of exercise at this time is quite normal and
beneficial, except where there is an actual disorder of some sort. In
this case a physician should be consulted.

3. _Rest and Conserve Energy_--Go to bed early and sleep from eight to
eleven hours, according to age. Sleep with windows open all the year
round. Rest sometime during the day, flat on the back if possible, but
even five minutes sitting quietly with hands in the lap and eyes closed
is better than nothing. The following table shows the number of hours of
sleep that are needed at different ages:

_Age_ _Hours of Sleep_

10 and 11 years 9-1/2 to 11

12 and 13 years 9 to 10-1/2

14 and 15 years 8-1/2 to 10

16 and 17 years 8 to 9-1/2

18 and 19 years 8 to 9

20 and over at least 8

Save Your Eyes

The reason it is important to rest and to sleep enough is because it is
while at rest that the body regains energy lost during activity, and
stores it up for future work and play. There are other ways of saving
energy, and one of them is by keeping the body in such good repair that
like a good machine it does its work with a minimum expenditure of force
and heat. This is the main reason for the setting-up exercises, or
indeed for any sort of exercises. Perhaps the single best way to save
energy is by saving your eyes. There is almost no work or play that does
not involve the use of our eyes. If people are blind they can learn to
do many things without vision, but it is infinitely harder than with it.
Modern life, especially in cities, makes a constant demand on our eyes,
and more than this, the demand is on one part of the eyes--the muscles
concerned in near work. The best way to rest the eyes, and one which not
only rests the tired parts but exercises the parts that are not used, is
by doing things that will involve _distant vision_. Walking and looking
far ahead and far away on every side rests the eyes best of all, and
this is one reason why a good walk will often clear up a headache.
Another way to insure distant vision is by riding backward in a car.
Then as the landscape flows past you, your eye muscles relax to the
position needed for distant vision. If you cannot walk or ride and are
doing clos