Who suggested that animal spirits flow through the nerves so as to produce movements of the body?
it depends on what you mean by other forms. Ghost or spirits are beings invisible to our eyes unless they show them selves through manifestation. There are different types of ghosts, if thats what you mean. Residual spirits are ghosts who can only make them selves known through sound, touch, and smell Presidual spirits are ghosts that are able to make them selvesvisible.