Another was plagued by voices, which said "Pray," and so forth.
Thus, on scientific evidence, sane and healthy people may, and "in a notable proportion _do_, experience hallucinations".

That is to say, they see persons, or hear them, or believe they are touched by them, or all their senses are equally affected at once, when no such persons are really present.

This kind of thing is always going on, but "when popular opinion is of a matter-of-fact kind, the seers of visions keep quiet; they do not like to be thought fanciful or mad, and they hide their experiences, which only come to light through inquiries such as those that I have been making".
We may now proceed to the waking hallucinations of sane and healthy people, which Mr.Galton declares to be so far from uncommon.

Into the _causes_ of these hallucinations which may actually deceive the judgment, Mr.Galton does not enter.
STORY OF THE DIPLOMATIST {56a} For example, there is a living diplomatist who knows men and cities, and has, moreover, a fine sense of humour.

"My Lord," said a famous Russian statesman to him, "you have all the qualities of a diplomatist, but you cannot control your smile." This gentleman, walking alone in a certain cloister at Cambridge, met a casual acquaintance, a well-known London clergyman, and was just about shaking hands with him, when the clergyman vanished.