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Updated: June 19, 2025
In the first place, it was quickly found that by a most merciful squeamishness on the part of the plasmodium, it could live only in the juices of one particular genus of mosquito, the Anopheles; and as nowhere, not even in the most benighted regions of Jersey, has this genus been found to form more than about four or five per cent of the total mosquito population, this cuts down our problem to one-twentieth of its apparent original dimensions at once.
In 1880 Laveran had described an animal micro-organism, which preyed upon the red corpuscles of the blood, producing an attack of fever with the cycle of its existence. Subsequent studies confirmed and elucidated this fact, and the plasmodium malariae became a matter of common knowledge.
The story of the plasmodium is one of the most beautiful illustrations of the fact that there is no such thing as useless or unpractical knowledge. The only thing that makes any knowledge unpractical is our more or less temporary ignorance of how to apply it. The first question which instantly raised itself was, "How did the plasmodium get into human blood?"
Consequently, marshy districts that are full of mosquitoes are not malarious unless the mosquitoes are of the kinds capable of lodging the plasmodium, and unless there is or has recently been present in the neighborhood some person affected with malarial disease.
All these disciples, heedless of the problem presented to their minds by the sexual form of the plasmodium, left it alone, although it had not yet been solved, and certainly had no intuition of the fame, the progress in science, and the benefit to humanity which would have been the outcome, had the problem constituted an obstacle which had arrested their attention, saying: "Solve me."
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