Germicidal Action of Daylight on Meningococci in the Dried State

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Abstract
Meningococci dried in films on the surfaces of glass beads, and pieces of wood, and cotton fabric contained in unsealed pyrex Petri dishes were exposed to different intensities of natural illumination and cultured at intervals to determine the duration of viability. They were killed by sunshine within a very few hrs. even when protected against heating. On glass beads and cotton gauze they were killed by diffuse daylight passing through 2 layers of glass[long dash]ordinary window pane and pyrex Petri dish, within 30 hrs.; on cotton toweling and on wood, they died a little more slowly. Light passing through cellophane of different colors did not kill them at the same rate. In red light they survived almost as long as in the dark.

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