energy and activity. The common estimate is that meat should occupy
one-fourth and vegetable food three-fourths of a mixed diet.

Common salt in moderate quantity is essential, but all highly spiced
or seasoned foods should be avoided, also pickles and vinegar. All
"sweets" are harmful, because they destroy the appetite for other
things and upset the digestion. Tea and coffee should be tabooed, as
well as all alcoholic beverages.

Good digestion depends for the most part on serving the meals at the
same hour every day, eating leisurely, and masticating the food well.
There is a great tendency on the part of the school girl to sleep late
in the morning, then "bolt" her breakfast in order to get to school in
time. Nothing could be more pernicious to the digestion, unless it is
the eternal nibbling of candy.

A healthy girl needs nothing between meals. A delicate girl will be
the better for a glass of milk in the middle of the morning and at
bed-time; or pure beef juice may be given instead.

Water.-- Water is needed to keep the kidneys properly flushed. The
amount of urine secreted during the twenty-four hours should be three
pints. Of course it will be less than this if the quantity of water is
insufficient. In addition to the urine about ten ounces of water are
lost from the surface of the lungs, and eighteen ounces from the skin,
making a total of about five pints; and this quantity of water must be
taken daily in order to maintain the equilibrium of the body. The
solid food of a mixed diet contains from fifty to sixty per cent. of
water, so that about twenty-five ounces of water are taken into the
system daily as an integral part of the food. In addition, three pints