When we think about our way of seeing, appreciating and understanding the different forms and manifestations of the life of the mind in human civilization, we become aware of a rather surprising fact. We are ready and spontaneously inclined to place them in a historical perspective and consequently to judge them according to a “historical consciousness”, with practically only one exception, that of science. No one finds it difficult to admit that the poetry of Homer, Virgil, Dante, Goethe or Baudelaire has always been an authentic poetry, attaining the heights of absolute value and even at times being incomparable, all the while recognizing that to understand this poetry, to appreciate its nobility and penetrate its meaning the effort must be made to put it within its historical context (and ideally to put oneself within that context) rather than to judge it according to the modes and forms of the poetry of our own day. What we have just said regarding poetry also applies to music, the fine arts, philosophy, law, social and political institutions, ethical concepts, religions and customs. In the case of science, on the other hand, such a historical consciousness is almost entirely lacking, even among cultivated people: the history of the sciences is not normally a part of the store of knowledge of these people, but this situation, far from being the cause of such a lack of historical consciousness, is rather the consequence. This is because we are unconsciously persuaded that science is not properly speaking a historical phenomenon; we have the impression that it has not had a real history.