Yellow fever is carried from one} person to another by a mosquito which lives in the barrels in which the natives of South America keep their drinking water. Each family has kept its own supply of yellow fever carriers, so to speak, and many times ports of the west coast have been closed against ships on account of outbreaks of yellow fever. Recently the Sanitary Commission of Ecuador began experiments with various fishes which would eat the mosquitoes in the barrels. Some fishes ate the "wrigglers'' which develop into mosquitoes, and it was found that two fishes, called '"'chalacos" and '"'huai-the natives, did the woris The "'chalacos'' is found everywhere along the tropical part of the Pacific coast and will be available for mosquito control along the entire danger zone from Peru to Cilifornia. Others of the same species found in similar situations cover the entire danger zone in the West Indies and hot Atlantic coast.
The second species, called '"huai-jas" would be even better able to control the situation than the "chalacos" if it did not have the habit of jumping out of the barrels. This fish is confined to fresh water vie
Text read from the printed page and cleaned; old type leaves the occasional error.