"Ah, ha! you have been going barefooted, my little man, and some young hookworms that were in the ground or grass have gone through the skin on your feet and made your toes and feet sore."
"What are hookworms, Uncle?" asked Will. Uncle John told him this:
"The hookworm is a very small worm, about a quarter of an inch long, or a little more, when it is grown. It was first brought to America from Africa by the negroes—the slaves that the Dutch people traded to our forefathers in the colonial days.
"The little worm is called the 'American Murderer,' because it kills so many people of the southland. It does not hurt the little negro children as badly as it does the white children.
"The hookworm eggs are hatched in the sand. The young hookworm sheds its skin two or three times, growing a little larger each time it sheds.
"Sometimes it will crawl upon a grass blade, or lie in the sand until a little barefooted boy or girl comes stepping along. (The worm is now so small that it cannot be seen.) The little folks step on the worm, and it pushes its way through the skin. This is when it makes the sores on the feet and between the toes.
"As soon as the little hookworms get through the skin they go into the blood. They are carried to the heart and lungs by the veins. They go from the lungs into the wind-pipe, and then crawl from the wind-pipe into the gullet. It is then an easy matter for them to get into the food tube in the body.
"The mouth of the hookworm has a sharp hook which it fastens into the wall of the food tube. It hangs there and sucks all the blood it wants. A hookworm will suck a drop of blood a day. In feeding themselves they are slowly bleeding the person, drop by drop. This is the reason the boys or girls who have hookworms look so pale, and feel so tired all the time. The hookworm robs them of the good rich blood, and makes children, and even grown persons, dull and lazy. The disease keeps children from growing.
"It is easy to cure the disease, but it is better to prevent it. We can prevent hookworm disease by preventing the ground from being polluted. Polluted ground means that which is made unclean with waste matter from our bodies. The eggs are found in this matter which pollutes the ground.
"Now, Will, always wear your shoes, and see that the soles are good and thick. Then, even though the ground is unclean, hookworms can't get to your feet. I am sure, now that you know about hookworms, you will not go barefooted through the lanes again."