Abstract: We afford some clues for the history of research on measurement of the fundamental charge,i.e.,Millkan oil-drop experiment and the controversy about data treatments therein.Some related references are briefly introduced to help readers who just start to concern to get at the core of the topic soon.Some historic materials for the expectation bias phenomena in research during a long time are quoted in order to arouse public attention.

Key words: Millikan, oil-drop experiment, fundamental charge, expectation bias