I say pity me and pardon me. But I want to ask you something privately, between our two selves; and I will feel more of equality than if you were looking at me, whilst I cannot see you.’ Mr Hilton blew out the candle.

‘There! We are equal now.’

‘Thank you!’ A long pause; then he went on:

‘When a man becomes suddenly blind is there usually, or even occasionally, any sort of odd sight? � Does he see anything like a dream, a vision?’

‘Not that I know of. I have never heard of such a case. As a rule people struck blind by lightning, which is the most common cause, sometimes remember with extraordinary accuracy the last thing they have seen. Just as though it were photographed on the retina!’