In his treatise "On the Methodology of Criticism" Walter Dubislav erects a theoretical framework which enables him to discuss the assertive force of transcendental arguments. Drawing on the account of J. F. Fries and L. Nelson, Dubislav arrives at the conclusion that the case of transcendental deduction can be stated in an unobjectionable way. In the line of thought explored in this paper transcendental arguments are supposed to be not logical proofs but "demonstrations' (Aufweisungen) of a weaker type.