Bolzano and (the young) Husserl on intentionality

In the "Prolegomena to Pure Logic" of his Logical Investigations (LI) Husserl praised the first two volumes of Bernard Bolzano's Wissenschaftslehre (WL) of 1837 as "a work which. far surpasses everything that world-literature has to offer in the way of systematic contributions to logic". This paper is about the early Husserl as a reader of Bolzano's masterpiece, hoping thereby to contribute to a proper understanding of certain aspects of Bolzano's and Husserl's theories and of what those theories are about. I shall concentrate on the question how Bolzano in 1837 and Husserl around 1900 conceive of the contents of mental acts and states. In sections 1-2 I report on the rediscovery of Bolzano's WL in the school of Brentano, and as regards the issue of objectless presentations, I endorse Husserl's defence of Bolzano against Twardowski. In sections 3-4 I present an outline of Bolzano's theory of propositions (Satze an sich) and notions (Vorstellungen an sich) and go on to show how Husserl assimilates the Bolzanian framework in his LI. While Bolzano takes propositions and notions to be sui generis abstract objects, the early Husserl develops a species conception of notions and proposition. I explain this view in section 5 and defend it against Husserl's later self. The most extensive and most thorough discussion of a single contention in Bolzano's philosophy of logic that can be found in any of Husserl's books and articles published during his lifetime is contained in the last chapter of his LI. The topic of this discussion, and of the final section of this paper, is a courageous if not outrageous Bolzanian contention : questions, he claims, are a special kind of propositions and hence truth-evaluable.