universal scepticism. Hume himself suffered unspeakably under the
impact of what he considered inescapable ideas - rightly described from
another side as the 'suicide of human intelligence' - and his
philosophy often seemed to him like a malady, as he himself called it,
against whose grip he could see no remedy. The only thing left to him,
if he was to prevent philosophical suicide from ending in physical
suicide, was to forget in daily life his own conclusions as far as
possible.

What Hume experienced as his philosophical malady, however, was the
result not of a mental abnormality peculiar to himself, but of that
modern form of consciousness which still prevails in general today.
This explains why, despite all attempts to disprove Hume's philosophy,
scientific thought has not broken away from its alpha and omega in the
slightest degree.

A proof of this is to be found, for example, in the principle of
Indeterminacy which has arisen in modern physics.

*

The conception of Indeterminacy as an unavoidable consequence of the
latest phase of physical research is due to Professor W. Heisenberg.
Originally this conception forced itself upon Heisenberg as a result of
experimental research. In the meantime the same idea has received its
purely philosophical foundation. We shall here deal with both lines of
approach.

After the discovery by Galileo of the parallelogram of forces, it
became the object of classical physics - unexpressed, indeed, until