Alternatives in the History of Science. The paper deals with the function of the scientist's subjective activity in the research process. This will be discussed at the background of the discourse between distant action and narrow action theories of electromagnetism in 19th century physics. The analysis shows in which high degree the protagonists of these theories (Weber, Maxwell) regarded this situation consciously as a bifurcation (alternative) in the development of their science. This article describes then how the history of science values the case. The result of this valuation is dependent on the different philosophical points of view. Finally we point out some desiderata for the further discussion on methodology of science that would be the consequence of the acknowledgement of real bifurcations in scientific thought.