Abstract
Typhoid bacilli are about one two-hundredth as sensitive to ultraviolet light of wave-lengths 2100 to 2800 Angström units as is the photographic plate. This sensitivity then falls off, decreasing rapidly to almost zero sensitivity at about 2970, the beginning of the sun's spectrum.
Highlights
T h e following data as to the bactefiddai action of ultra-violet light on typhoid bacilliwere obtained by a method different from that heretofore used and the results give additional evidence toward setfling certain disputed phases of the subject.In 19101and again in 19123 Victor Henri and hisassociatespublished articleson thissubjectin which they giveevidence to show that the bactericidaleffectofultravioletlightfirstbecomes appreciable at 3000 ~ngstrSm units,and increasesprogressivelyfrom theredownward toward 2150 ~ngstrSm units
The sterilizing action of the light gave a photograph of the active portion of the spectrum
Lymann4has shown that the abiotic effect of ultra-violet light increases rapidly below 2000 ~ngstrSm units to become almost instantaneous at 1750
Summary
T h e following data as to the bactefiddai action of ultra-violet light on typhoid bacilliwere obtained by a method different from that heretofore used and the results give additional evidence toward setfling certain disputed phases of the subject.In 19101and again in 19123 Victor Henri and hisassociatespublished articleson thissubjectin which they giveevidence to show that the bactericidaleffectofultravioletlightfirstbecomes appreciable at 3000 ~ngstrSm units,and increasesprogressivelyfrom theredownward toward 2150 ~ngstrSm units. A Browning and Russ read a paper on this subject recently before the Royal Society which has not yet appeared in print. As this proof goes to print the paper of Browning and Russ has appeared Series B, 1917, xc, ABIOTIC ACTION OF ULTRA-VIOLET LIGHT
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