Thousands of adult mosquitoes had been destroyed in Havana by systematic fumigation of houses wherein yellow-fever cases had been found. Doors and windows had been sealed off with newspaper, room by room, and pans full of sulphur or powdered pyrethrum (a dried flower used as an insecticide) had been burned for an hour or more. But the main attack had been on water jars, barrels, cisterns, any stray bucket, tin can, or broken dish in which rainwater might collect. A card file had been made on every house and building within city limits; the city had been divided into sections and inspectors had
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