  Zabarella’s conclusion about the relationship between the art of medicine and natural philosophy is that the latter must consider the universal qualities of health and sickness, while the former concentrates on finding remedies for particular diseases. Zabarella suggests that Aristotle wrote a book of health and sickness of which nothing but a small fragment remains. These fragments are on the borderline of these two disciplines. Zabarella sums this up: where the philosopher ends, there the physician begins (ubi desinit philosophus, ibi incipit medicus). From the universal consideration of sickness and health the physician descends to the treatment of all particular diseases and to knowledge of their causes. While discussing the principles of medical art Zabarella compares anatomical principles with principles derived from natural philosophy. In his view, only the philosophy of nature, not anatomy, can provide a solid basis for medical practioners (Mikkeli 1997, pp. 221–225).