Nobel laureate Erwin Schrodinger was one of the most distinguished scientists of the twentieth century; his lectures on the history and philosophy of science are legendary. This volume makes available for the first time in many years the texts of two of Schrodinger's most famous lecture series. Nature and the Greeks offers a comprehensive historical account of the twentieth-century scientific world picture, tracing modern science back to the earliest stages of Western philosophic thought. Science and Humanism addresses some of the most fundamental questions of the century: what is the value of scientific research? And how do the achievements of modern science affect the relationship between material and spiritual matters? A foreword by Roger Penrose sets the lectures in a contemporary context, and affirms they are as relevant today as when they were first published.