found to be more fast than non-guaranteed and dark colors more permanent than light colors. No one color, however, can be said t o be more fast to sunlight than another, the fastness depending on the particular dye when used alond or in combination with other dyes. Ultraviolet radiation, known to be an important constituent of sunlight, was found to be greater a t College Station than a t Chicago, Honolulu, or San Juan. Hence fading and loss in strength are probably greater in this region than elsewhere. These results suggest to the consumer the importance of avoiding unnecessary exposure to sunlight of cotton fabrics, whether white or colored, and the desirability of purchasing materials guaranteed to be color fast. They suggest to the manufacturer producing fabrics for regions having sunlight rich in ultraviolet radiation, the necessity of using only the more permanent dyes. They suggest to the farmer the possibility of producing a more valuable product by reducing the period of exposure in the field, a point now under investigation.