The electrical conduction of dry and normal cork (ambient RH) has been investigated in the temperature range from -100 to 105 degreesC. Samples of 3 mm in thickness were deliberately used in order to be possible to measure the bulk properties of the material including bulk DC conductivity and water diffusion. Additional results were obtained using isothermal charging and discharging currents, thermally stimulated discharging currents and dielectric: relaxation measurements. The diffusion coefficient for water is about 6.8 x 10(-13) m(2) s(-1) and the intrinsic electrical conductivity at 25 degreesC is 2.9 x 10(-14) S m(-1).