National Geographic : 1914 Mar
FIGHTING THIE PANAMA MOSQUITO WITH OIL These sanitary drip-barrels automatically spread oil, drop by drop, over pools, streams, and marshy places, thereby preventing the mosquito from breeding in the water. "He (Ross) proved beyond any peradventure that the Anopheles mosquito is the intermediate host. and that no one can contract malaria except he he bitten by a mosquito which has previously bitten a person suffering from that disease" (see page 347). blame upon the mosquito, and charged that it introduced a poison similar to snake venom into the human system through the biting process. Step by step a closer approach to the truth was made, and in 1883 Sir Patrick Manson demonstrated that the mosquito was the intermediate host of the blood parasite filaria. lIut it was not until Sir Ronald Ross arrived upon the scene with his investi gations that the real truth of the prin ciple of insect-borne diseases came to be understood. Prior to this Laveran had succeeded in isolating the germ of ma laria: and, building upon this foundation, Ross labored to ascertain the exact rela tion between man and the mosquito.