Who is Edgar Cayce from Out on a Limb and what is their importance?

Edgar Cayce is one of the first documented trance mediums. Cayce is a farmer who suffers from asthma. While under hypnosis to treat his ailment, Cayce channels a man who gives instructions on how to treat the ailment. Cayce follows these instructions and is cured of his illness. Afterward, Cayce learns to put himself in a trance so that he might channel this man for other people.