After the worm gets through the skin, it is taken into the blood and carried to the lungs, and from there it finds its way to the throat and is swallowed. It makes no difference whether the hookworm is swallowed or enters the body through the skin; it finally reaches the intestinal canal, where it then makes its home. Sometimes thousands of these worms are found in a single person, and each one of them entered the body through the mouth or through the skin. The worms do not multiply in the body, and the eggs they lay never hatch until after they have left the body. [Sidenote: How it affects the patient] When the hookworm gets into the intestinal canal, it fastens itself to the wall and sucks the blood from it, at the same time giving off a poison that enters the blood of the victim. The loss of blood and the effects of the poison soon cause the person in whose body these worms are living to become weak, pale, and thin. He is not able to do much work, if any, and the result is that people suffering from this disease are often called lazy. They are not lazy; they are sick, and many of them die. [Sidenote: How hookworm disease can be prevented] All this sickness and all these deaths might be prevented simply by the proper disposal of human excreta. No human excreta should ever be put anywhere except into a properly constructed sewer or properly constructed privy. If this rule were always observed, both hookworm disease and typhoid fever would be abolished. [Sidenote: Where amoebic dysentery prevails] Amoebic dysentery is another disease that is confined almost entirely to tropical and subtropical climates, though cases sometimes occur in colder regions. [Sidenote: How it is spread and how it may be prevented] This disease, like typhoid fever, is caused by a germ that leaves the body with the bowel discharges. The germ makes its way into the body in the same way that the typhoid germ enters; that is, it is taken in with food or drink. The various means by which this germ gets into our food are the same as those by which the typhoid germ gets in; and the precautions that will prevent the spread of typhoid fever will also prevent dysentery. Amoebic dysentery kills a great many people in warm climates, though it does not kill as many as does typhoid fever. If it does not cause immediate death, it often leaves the patient very weak and sickly for months or years. =Questions.= 1. In what climates are hookworm disease and amoebic dysentery commonly found? 2. In what respects do they resemble typhoid fever? 3. How does the hookworm enter the body? 4. Where do the hookworm eggs hatch? 5. How can hookworm disease be prevented? 6. What other diseases can be prevented by the same precautions?