The following is the text of an address made before the North American Academy of Manipulative Medicine in 1980. Since then, refined editions have been present to the following: Medical College of Virginia, Anatomy Department of Howard University. The Paleontology Society of the Smithsonian Institution, the Alliance for Engineering in Biology and Medicine (fall, 1981). Presentation to the International Society for the Study of the Lumbar Spine in Toronto is scheduled for June, 1982.