Of course, an experiment will exhibit them to intuition in some concrete case; The idea of cognition but, in order for the experiment to be scientific, it must admit only such conditions as are necessary to it, and it must be repeated in various forms in order to demonstrate that the concrete cluster of conditions that cannot be separated from the matters under consideration are inessential, for these can appear in one concrete configuration and then again in another, so that only their abstract form is left for cognition.