My investigation into the nature of the modal concepts Husserl employs is motivated by the expectation that we may thereby be able to gain a deeper understanding of some of his crucial philosophical moves. The immediate stimulus for such an enquiry, however, was provided by Jaakko Hintikka's book The Intentions of Intentionality in which he attempts an interpretation of Husserl's notion of intentionality from the standpoint of possible world semantics.¹