Abstract
1. No evidence was secured to show that yeast cells possess any marked resistance to ultraviolet light. They were able to live only from a few seconds to a few minutes longer than bacteria. This is reasonably explained by the difference in size. 2. Pigmented yeasts are more resistant than white yeasts. This is due to the resistance to penetration of the rays. 3. Exposure of contaminated yeast cultures to ultraviolet rays did not increase their fermenting abilities. This is in accord with the data of Maurain and Warcollier for cider fermentation, and Schnitzler and Henri for acetic acid fermentation. 4. The data presented herewith and that of other investigators indicate that there is a direct relation between the size of the cell and its resistance to ultraviolet light.
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