Scientific communication traditionally proceeds from the familiar to the new. This method is helpful to the reader because it is adapted to the principle of learning. In new perceptive acts the memory of old perceptions and conceptions is utilized. When comparison is invoked so that similarities and differences can be detected, the latter will be the more easily understood. A re-evaluation of established theories follows naturally, and this will be accepted or rejected on the basis of the reader's own experience and mode of thinking. To devote, however,