Our bodies are seething with electromagnetic forces. The heart generates a considerable magnetic field, pumping electrically charged fluid around the body. The brain too, and even our muscles, give off electrical waves - 'hertzian fields' - which can be picked up outside the body. The history of electro-magnetic diagnosis and treatment (dating from the 1930s) are narrated here, along with the latest developments with case histories from the author's allergy practice. Other topics covered include: research to show that healers can create huge surges in electromagnetic energy from their hands; Eastern traditions which are concerned with the flow of energy in the body: acupuncture meridians (energy pathways), ch'i (energy), the Ayurvedan prajna (breath) and the chakras (energy centres) and light and gem therapy. With the latest equipment it is possible to transmit, for example, sapphire and emerald to the brain at a 3.3 hertz frequency, the frequency of trance and dreaming.