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with care and intelligence; for this reason no mother should begin dosing her child with it without consulting a physician. REGARDING MOSQUITOES The following is an extract from a circular in relation to the causation and prevention of malaria and the life history and extermination of mosquitoes issued by the Department of Health, City of New York: Extermination and Prevention of Mosquitoes.--Mosquitoes require for their development standing water. They cannot arise in any other way. A single crop soon dies and disappears unless the females find water on which their eggs may be laid. In order to prevent mosquitoes, therefore, the requirement is simple. No Standing Water.--Pools of rain water, duck ponds, ice ponds, and temporary accumulations due to building; marshes, both of salt and fresh water, and road-side drains; pots, kettles, tubs, springs, barrels of water, and other back-yard collections, should be drained, filled with earth, or emptied. Running streams should have their margins carefully cleaned and covered with gravel to prevent weeds and grass at the water's edge. Lily ponds and fountain pools should, if possible, be abolished; if not, the margins should be cemented or carefully graveled, a good stock of minnows put in the water, and green slime (Algae) regularly cleaned out, as it collects. Where tanks, cisterns, wells or springs are necessary to supply water, the openings to them should be closely covered with wire gauze (galvanized to prevent rusting), not the smallest aperture being left. When neither drainage nor covering is practicable, the surface of the standing water should be covered with a film of light fuel oil (or kerosene) which chokes and kills the larvae. The oil may be poured on from a can or from a sprinkler. It will spread itself. One ounce of oil is sufficient to cover 15 square feet of water. The oil should be renewed once a week during warm weather. Particular attention should be paid to cess-pools. These pools when uncovered breed mosquitoes in vast numbers; if not tightly closed by a cemented top or by wire-gauze, they should be treated once a week with an excess of kerosene or light fuel oil. Certain simple precautions suffice to protect persons living in malarial districts from infection: Firs
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