[Expression between empiricism and speculation. Remarks on R. Kirchhoff's article by the same name].
Kirchhoff's objections are proved to be totally mistaken and untenable. The deficiencies of his argumentation are classified; especially are discerned: false quotations, distortions, imputations, unfair exactions, contradictory assertions, and ignorationes elenchi. Author's position, as it is attacked by Kirchhoff, is confirmed and made more plain. Possible topics of a more fruitful discussion with Kirchhoff are sought. His epistemological proposals of systems of orientation ("Bezugssysteme") may be suitable for that purpose, provided that their logical and terminological defects are removed.