Its appendices feature a presentation of the law of refraction, an explanation of the rainbow, and a demonstration that ruler-and-compass constructions are equivalent to the solution of algebraic equations.  
Its appendices feature a presentation of the law of refraction, an explanation of the rainbow, and a demonstration that ruler-and-compass constructions are equivalent to the solution of algebraic equations.  The appendices were intended to give examples of how one reasons using the author's four-part strategy whose rules included accepting only self-evident truths and dividing problems into small parts.  Among the earliest major philosophical works written in French rather than Latin, FTP, what is this discourse which rivals Meditations as the most famous work of Rene Descartes?
Its appendices feature a presentation of the law of refraction, an explanation of the rainbow, and a demonstration that ruler-and-compass constructions are equivalent to the solution of algebraic equations.  
Discourse on the Method of Rightly Conducting the Reason, and Seeking Truth in the Sciences (Discours de la m?hode pour bien conduire sa raison et chercher la v?it?dans les sciences)