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The goal of this article is to clarify the reasons why Rickert maintains the necessity to perform a logical analysis of historical sciences despite of the objection of « formalism » one has raised against him. Taking into account his opposition to the representatives of a merely ontological or « material » articulation of empirical sciences, I suggest that Rickert’s defence of a logical and « formal » approach simply means a provisional method whose purpose is not to eliminate all ontological considerations about historical objects, but rather to provide a critical grounding for such considerations by means of the « logical disjunction » between « generalizing sciences » and « individualizing sciences ». This method must finally indicate what is any historical object in the formal broadest sense of the term. It has therefore to ground, so to speak, a formal ontology of historical object.