The Action of Radiation in the Extreme Ultra-violet on Bacillus subtilis Spores

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Abstract
Irradiation from a carbon electrode spark-gap, in parallel with a 15,000 volt sign-lighting transformer and a 0.016 microfarad condenser, was allowed to pass through 2 L.F crystals and thence onto the surface of a culture medium previously inoculated with B. subtilis spores. The medium was 2.5 cm. from the spark. Irradiation times were 10 to 50 seconds. One crystal transmitted radiation down to 1100 A; the other to 1400 A. Sparse subsequent growth under the 1st crystal as compared to the heavy growth under the 2d showed the germicidal or antiseptic action of radiation between 1100 A and 1400 A.