VII.

_THE CARE OF HEALTH._

Importance of some knowledge of the body and its needs--Fearful responsibility of entering upon domestic duties in ignorance--The fundamental vital principle--Cell-life--Wonders of the microscope --Cell-multiplication--Constant interplay of decay and growth necessary to life--The red and white cells of the blood--Secreting and converting power--The nervous system--The brain and the nerves--Structural arrangement and functions--The ganglionic system--The nervous fluid--Necessity of properly apportioned exercise to nerves of sensation and of motion--Evils of excessive or insufficient exercise--Equal development of the whole.