Page:The House of Souls.djvu/520

 'Do you know, Phillipps,' said Dyson, as he strolled at ease up and down the room, 'I will tell you how I work. I go upon the theory of improbability. The theory is unknown to you? I will explain. Suppose I stand on the steps of St. Paul's and look out for a blind man lame of the left leg to pass me, it is evidently highly improbable that I shall see such a person by waiting for an hour. If I wait two hours the improbability is diminished, but is still enormous, and a watch of a whole day would give little expectation of success. But suppose I take up the same position day after day, and week after week, don't you perceive that the improbability is lessening constantly—growing smaller day after day? Don't you see that two lines which are not parallel are gradually approaching one another, drawing nearer and nearer to a point of meeting, till at last they do meet, and improbability has vanished altogether? That is how I found the black tablet: I acted on the theory of improbability. It is the only scientific principle I know of which can enable one to pick out an unknown man from amongst five million.'

'And you expect to find the interpreter of the black tablet by this method?'

'Certainly.'

'And the murderer of Sir Thomas Vivian also?'

'Yes, I expect to lay my hands on the person concerned in the death of Sir Thomas Vivian in exactly the same way.'

The rest of the evening, after Phillipps had left, was devoted by Dyson to sauntering in the streets, and afterwards, when the night grew late, to his literary labours, or the chase of the phrase, as he called it. The next