The original stimulus for the choice of this topic was a book on intellectual history. One of the most brilliant authors in this field, Carl Becker, claims that the most important event in the intellectual history of modern time was the shift in the place of logic in science. According to Becker, the high esteem for logic which the scientist had in the age of St. Thomas Aquinas and through all the Middle Ages declined in the period of Galileo and Newton. But at that time this decline was not yet fully understood. “The marriage of fact and reason” as Becker expresses himself “proved to be somewhat irksome in the nineteenth century and was altogether dissolved in the twentieth century.” The modern, twentieth century, physicist lives in an “atmosphere, which is so saturated with the actual that we can easily do with a minumum of theoretical” … “We have long since learned not to bother much with reason and logic.” To describe the spirit of twentieth century physics which emphasizes facts and minimizes reason Becker says: “Experiments seem to show that an electron may, for reasons best known to itself, be moving at two orbits at the same time. To this point Galileo's common sense method of noting the behavior of things, of sticking close to the observable facts has brought us. It has at last presented us with a fact that common sense repudiates.”