The communication of the knowledge may be done by audible words, with or without an actual apparition, or with an apparition, by words or gestures.

Again, if a hallucination of Jones's presence tallies with a great crisis in Jones's life, or with his death, the hallucination is so far veracious in that, at least, it does not seem meaningless.

Or if Jones's appearance has some unwonted feature not known to the seer, but afterwards proved to be correct in fact, that is veracious.

Next, if several persons successively in the same place, or simultaneously, have a similar hallucination not to be accounted for physically, that is, if not a veracious, a curious hallucination.

Once more, if a hallucinatory figure is afterwards recognised in a living person previously unknown, or a portrait previously unseen, that (if the recognition be genuine) is a veracious hallucination.