  Both kinds of elements can be found in each thought style, and also in mythical and religious thinking. In one place Fleck notices that whereas a myth has little passive elements, the characteristic feature of science is that it attempts to add as many passive elements as it can to its system. Fleck never developed this idea, and this is unfortunate, for this could be his contribution to the solution of the problem of demarcation. There are some places where he makes remarks complementing argumentation developed in the last chapter: “What has previously been classed with the passive elements of knowledge may later join the active ones” (1935a, IV.2). We should regret again that he did not develop the idea which could contribute to understanding the mechanism of those transformations which Kuhn later called “scientific revolutions”. For it suggests that not only pre-scientific proto-ideas, but also passive results obtained within an old scientific thought style can serve as a starting point for constructing a new one.