_The treatment_ is both preventive and curative. If the gape-worm is known to be present in the runs, the ground should be covered with lime, and the fowls moved to fresh runs if possible. The young birds should not be exposed to the infection until they are well feathered out. Antiseptics may be given with the drinking water. Disinfectants should be used freely about the poultry houses, and the quarters kept clean. The worms may be snared by inserting a stiff horse hair that has been twisted and forms a loop into the trachea. This may be dipped into camphorated oil or turpentine. This treatment should be repeated until the bird has been relieved. QUESTIONS 1. Name the different groups of internal parasites; give examples of each. 2. What conditions favor liver rot? Give the life history of the liver fluke. 3. Name three common tapeworms; give the life history of the beef and pork tapeworms. 4. Name the common intestinal worms of horses and give the treatment. 5. Give the symptoms and treatment of stomach-worm disease of sheep. 6. Name the common intestinal worms of hogs and give treatment. 7. What species of domestic animals suffer most of verminous bronchitis? Give the treatment. 8. Name the common internal parasites of poultry and give treatment. PART VI.--INFECTIOUS DISEASES CHAPTER XXVI HOG-CHOLERA HOG-CHOLERA is a highly infectious disease of swine. It is characterized by an inflammation, of the lymphatic glands, kidneys, intestines, lungs and skin. The inflammation is hemorrhagic in character, the inflamed organs usually showing deep red spots or blotches. Hog-cholera is especially prevalent in the corn-raising States which possess a denser hog population than any other section of the United States. In this country the loss from hog-cholera in 1913 amounted to more than $60,000,000, and it may be considered of greater economic importance than any of the other animal diseases. SPECIFIC CAUSE.--The specific cause of hog-cholera is an _ultra-visible organism_ that is present in the excretions, secretions and tissues of a cholera hog. De Schweinitz and Dorset in 1903 produced typical hog-cholera by inoculating hogs with cholera-blood filtrates that were free from any organism that could be demonstrated by microscopical examination or any cultural method. The term ultra-visible virus is applied to the virus of hog-cholera. _The ultra-visible virus_ is eliminated from the body of the cholera hog with the body secretions and excretions. Healthy hogs contract the disease by eating feed or drinking water that is infected with the virus. There are other methods of infection, but field and experimental data show that hog-cholera is commonly produced by taking the germs into the body with food and drinking water.