Steiner begins by describing the interplay of physical and metaphysical aspects of the human being, presenting a paradigm in which the four bodies--physical, etheric, astral, and "I"--interrelate in contrasting ways with the threefold human organism of head, thorax and metabolism and with our capacities for thinking, feeling, and volition. These challenging but enlightening concepts unlock a wonderful diagnostic tool for appraising and understanding patients. He considers the medicinal actions of various substances, including silica, phosphorus, sulfur, arsenic, antimony, and mercury. This volume also features Steiners answers to questions, an introductory lecture to eurythmy therapy, a comprehensive introduction, notes and index, 9 color plates of Steiners blackboard drawings, and facsimiles and translations of his notes for the lectures.