A database of dielectric properties of tissues has been compiled for use by the scientific community in solving electromagnetic interaction problems. This has been achieved in the frequency range 1 MHz to 20 GHz. Work is currently underway to extend it lower in frequency. During the course of the study new data have been obtained corresponding to bone and cartilage tissue. An analysis of a subsection of the data showed that it can be used to gain an insight into the nature of water in tissue.