What move the muscles? How are the nerves in early youth? Of what are they composed? What are these parts called?
What is the brain? How is it protected?
Where do nervous impulses begin? To what may the gray and white matter be compared?
What is the spinal cord?
How many pairs of nerves are given off from the brain? From the spine? Where do they go?
What is said of sensation and feeling? What if you obey the laws of health?
CHAPTER XVI.
SUNSTROKE AND POISONS.
Don't be afraid of the sun. Its rays give life and vigor not only to men and animals, but to the vegetable world. A little tanning or browning of the skin is good for you. In summer when the rays are very strong, you should avoid them; but at other times, live in the sunlight all you can.
Very rarely indeed is a child sunstruck; but it is wise to guard against it, because it is often fatal. As I have just told you, you must keep out of the direct rays of the sun when the day is very hot. It is well to carry a wet handkerchief, or several large green leaves in the crown of your hat.