Variation in Pigment Production in Staphylococcus aureus

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Abstract
An extract has been prepd. from S. aureus 6538, a highly chromogenic organism, which has the potentiality of inducing or stimulating chromogenesis in colonies of a white strain of the same species. The extract prepd. gives negative Millon, xanthoproteic, and Benedict tests, and a slightly positive test for pentose (Bial). The newly isolated chromogenic organisms retain the biochemical properties of the parent culture, differing only in pigment production. The intensity of pigment production is not so great in the new strains as in the strain from which the extract was prepd. nor does it seem to be lasting.