Book excerpt: Volume 4, translated for the first time in English, contains seven parts. Part 22: On Dysfunctions in Various Parts of the Body, Avicenna gives a detailed analysis of the pain that comes from various physical dysfunctions. Part 23: On Fevers is a famous section of his Canon, often published on its own in the Latin translation. Part 24: On Diagnosis Based on Symptoms includes a discussion on what a medical crisis is and how to deal with it. Part 25: On Swellings and Pimples includes these illnesses as part of Systemic Diseases along with Part 26: On the Loss of Continuity. Part 26 essentially deals with the importance of energy in Avicennian medicine and the resulting illnesses when the movement of energy is disrupted causing a loss of continuity in its flow. Part 27 describes Poisons and Part 28 the Cosmetic Art. Contains an index of the contents indexed by healing properties.