An apparatus for studying the drying of textile fabrics by high–frequency (dielectric) heating is described. Rate–of–drying curves for thirteen different textile materials, together with measurements of temperature and power consumption, are shown. With every material examined the drying curve shows a discontinuity and the rate of drying decreases at a certain moisture content, which in most cases approximates closely to the reported figures for saturation regain of the respective fibres. The water held by fibres at this moisture content is not free and has anomalous electrical properties. The practical advantages of high–frequency drying are discussed,