47. It is a mistake to make a sport of physical manifestations; if such manifestations no longer carry the weight of a philosophical teaching, they nevertheless are useful from the phenomenological point of view because they represent the ABCs of the science, to which they have provided the key. Although they are not as useful as they once were, they still help to convince certain people. Even so, order and decency should not be excluded from meetings where experiments are performed. If such experiments were always performed appropriately, they would more easily convince disbelievers and would in every respect produce better results.