ABSTRACT
The most straightforward path of evolution is the refinement of the tools used in a particular problem, for the more easy and effective production of the same sort of data and information. The patterns of evolution of problems and of tools present the sharpest possible contrast. The patterns of evolution of the objects of scientific inquiry are very similar to those of facts, since these are the things about which factual assertions are made. In the attempts to exhibit the logical structure of completed scientific knowledge there has been much analysis of the different status of facts, laws, theories, hypotheses, and models in their relations to particular experience. An analogous process can be seen in the development of chemistry, which emerged from the status of a tool-providing art for metallurgy and medicine to become an independent scientific discipline.
