Leaving aside for once all utilitarian considerations, this book attempts to demonstrate the role and influence of the natural sciences in the development of human thought and in shaping the way in which we perceive the world. This seems to be particularly necessary in the present day and age, in view of the fact that a large section of the public is scarcely aware of the great cultural contribution that the natural sciences make towards moulding our conception of the world and scarcely acknowledges their function in helping us to find our bearings in a world that is becoming increasingly complex.