Grimes on the tacking by disjunction problem

In this paper, I focus on the so-called ‘tacking by disjunction problem.’ Namely, the problem to the effect that, if a hypothesis h is confirmed by a statement e, h is confirmed by the disjunction e ∨ f, for whatever statement f. I show that the attempt to settle this difficulty made by Grimes 1990, in a paper apparently forgotten by today methodologists, is irremediably faulty.