  The victory of a given thought style is never ultimate. Each new experimental discovery and every theoretical idea more or less changes the whole system. Even if at the beginning one sees only what corresponds with the theory, after a while there appear complications and exceptions (Kuhn’s anomalies) which sooner or later leads to revisions of concepts and assumptions. “Mutations” in a thought style, such as contemporary transformations in physics or in bacteriology, constantly occur. Sooner or later we will have to change e.g. the law of conservation of energy (1935a, II.1) and any other concept and claim. In the historical development of science there is nothing determined once and for all, nothing invariant. Both thinking and facts change.