The Science Of Facial Expression: The New System Of Diagnosis, Based On Original Researches And Discoveries is a work that delves into the art and science of interpreting facial expressions to diagnose physical and mental states. The book proposes a novel approach, emphasizing how facial features, movements, and expressions can reveal underlying health conditions and emotions. Drawing on extensive research and personal discoveries, the author introduces a system that links the face to the body’s internal condition, offering a diagnostic tool that is both observational and holistic. The work suggests that the face acts as a mirror of one's health, capable of providing insights into potential illnesses, psychological states, and emotional imbalances. This system highlights the importance of recognizing and interpreting facial expressions as an integral part of understanding human well-being, proposing that proper analysis can lead to a more accurate diagnosis than conventional methods. This approach ultimately champions the connection between mind and body, encouraging practitioners to consider the visual cues of expression when assessing a person’s health, and introducing new methods of diagnosis through the observation of facial traits and movements.