Abstract
The history of Natural Philosophy is dominated by a paradox; broadly speaking, a vast increase in its range of application to the external world has been accompanied by a sweeping simplification in its basic assumptions. From the standpoint of Empiricism this dual development appears utterly mysterious. On the other hand, Rationalism, which seeks to demonstrate the metaphysical necessity of natural law, and hence might throw light on this development, has been generally discredited, particularly by men of science. It is not surprising, therefore, that philosophical discussion of scientific method has become a Babel of confusing tongues