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meal of blood, and each and every one of those fifteen mosquitoes, had fed, on various days before—on the blood of yellow-faced boys in the hospital of Las Animas.

Clad only in a nightshirt and fresh from a bath, Moran—who knows of him now?—walked into the healthy little room and lay down on his clean cot. In a minute that damned buzzing started round his head, in two minutes he was bitten, in the thirty minutes he lay there he was stabbed seven times—without even the satisfaction of smashing those mosquitoes. You remember Mr. Sola, whom Grassi tortured—he probably had his worried moments—but all Mr. Sola had to look forward to was a little attack of malaria and a good dose of curative quinine to get him out of it. But Moran? But John J. Moran was a hog for such tests! He was back there at four-thirty the same afternoon, to be bitten again, and once more the next day—to satisfy the rest of the hungry she-mosquitoes who hadn't found him the first day. In the other room of this house, with only a fine meshed but perfect wire screen between them and Moran—and the mosquitoes—lay two other boys, and those two boys slept in that house safely for eighteen nights.

But Moran?

On Christmas morning of 1900, there was a fine present waiting for him—in his head, how that thumped—in his eyes, how red they were and how the light hurt them—in his bones, how tired they were! A nasty knock those mosquitoes had hit him and he came within a hair of dying but (thank God! murmured Walter Reed) he was saved, this Moran, to live the rest of his life in an obscurity he didn't deserve. So Moran had his wish—in the interest of science, and for humanity! So he, with Folk and Jernegan and Cooke and all those others proved that the dirty pest hole of a house (with no mosquitoes) was safe; and that the clean house (but with mosquitoes) was dangerous, so dangerous! So at last Walter Reed had every answer to his diabolical questions, and he wrote, in that old-fashioned prose of his: "The essential factor in the infection of a building