_Treatment._—Efficient treatment can only be carried out in association with microscopic examination of the stools, and hence all that need here be said is that various worm medicines are employed, of which the most effectual are thymol and oil of chenopodium. These should be administered only under careful medical supervision. The anæmia has to be treated, and in the case of natives a nutritious and easily-digested diet is indicated; for example, for native coolies the following has been recommended: bread 1 pound, milk 2 pints, sugar 2 ounces, 2 eggs, and 4 bananas daily. Ground itch should be treated by an ointment containing zinc oxide and salicylic acid. _The Bilharzia Worm._—This worm, of which there are two species, produces the disease known as Bilharziasis or Schistosomiasis, which occurs in one or other, or both forms, in various parts of the world, but is specially prevalent in Egypt. _Cause._—The worms, which produce either urinary or rectal bilharziasis, live in parts of the human vascular system, where they produce their eggs. These eggs are furnished with spines, and hence cause irritation when lodged in the tissues. In the urinary form the eggs have a terminal spine, in the intestinal form the spine is lateral. These eggs are passed either in the urine or in the excreta and reach water, where they develop into larvæ. The larvæ enter special species of water snails, in which they develop, producing eventually tiny forms known as cercariæ. These cercariæ escape into the water and can penetrate the unbroken skin or intact mucous membrane. They thus get access to the bodies of persons who are bathing in the infected water, or who may drink it. Once in the human body, the blood carries them to the place where they develop into the adult worms, which eventually unite, and then the females begin producing the spined eggs. _Symptoms._—In the urinary form the chief symptom is the passage of bloody urine, which usually shows itself about three months after infection, and is often associated with a good deal of irritation of the bladder and the pipe. The intestinal form may produce various symptoms. Sometimes a condition resembling enteric fever occurs, sometimes one like dysentery. Diarrhœa is common. The condition is chronic and, if untreated, sets up all kinds of secondary effects, which need not be discussed.