Islamic philosophers call nature and beyond nature natural science, taking away from Greece, and what we call natural philosophy according to the distinction required in the modern era between philosophy and science, the concept of science now that the knowledge of objects analyzed to the parts of perception senses, and described the composition of these parts with each other, And the order of laws from the most general to the broader, until we reach a single comprehensive law; while the mind continues to penetrate as deeply as sensory knowledge; if the presentation of nature tried to explore the "principles of self and primary" component of the medical body . It refers to the self-principles which are the essence of the essence and not the superfluous; the primary principles mean those that precede the solution of symptoms and the link between the symptoms and the essence, and are only the principles of the essence.