But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.

It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory, resulting in a very great theoretical development, are completely trivial from any point of view except their relevance to the structure of a theoretical system.

The importance of certain problems concerning the facts will be inherent in the structure of the system.

If observed facts of undoubted accuracy will not fit any of the alternatives it leaves open, the system itself is in need of reconstruction.

But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.

Empirical interest will be in the facts so far as they are relevant to the solution of these problems.

A gloss is a total system of perception and language.