fluid--Necessity of properly apportioned exercise to nerves of sensation
and of motion--Evils of excessive or insufficient exercise--Equal
development of the whole.

VIII.

_DOMESTIC EXERCISE._

Connection of muscles and nerves--Microscopic cellular muscular
fibre--Its mode of action--Dependence on the nerves of voluntary and
involuntary motion--How exercise of muscles quickens circulation of
the blood which maintains all the processes of life--Dependence of
equilibrium upon proper muscular activity--Importance of securing
exercise that will interest the mind.

IX.

_HEALTHFUL FOOD._

Apportionment of elements in food: carbon, nitrogen, phosphorus,
calcium, iron, silicon, etc.--Large proportion of water in the human
body--Dr. Holmes on the interchange of death and life--Constituent
parts of a kernel of wheat--Comparison of different kinds of
food--General directions for diet--Hunger the proper guide and guard
of appetite--Evils of over-eating--Structure and operations of the
stomach--Times and quantity for eating--Stimulating and nourishing
food--Americans eat too much meat--Wholesome effects of Lenten
fasting--Matter and manner of eating--Causes of debilitation from
misuse of food.