erected a hydraulic press. This press, as I have already
explained, has got out of order, and we wish your advice upon the
subject. We guard our secret very jealously, however, and if it
once became known that we had hydraulic engineers coming to our
little house, it would soon rouse inquiry, and then, if the facts
came out, it would be good-bye to any chance of getting these
fields and carrying out our plans. That is why I have made you
promise me that you will not tell a human being that you are
going to Eyford to-night. I hope that I make it all plain?'

"'I quite follow you,' said I. 'The only point which I could not
quite understand was what use you could make of a hydraulic press
in excavating fuller's-earth, which, as I understand, is dug out
like gravel from a pit.'

"'Ah!' said he carelessly, 'we have our own process. We compress
the earth into bricks, so as to remove them without revealing
what they are. But that is a mere detail. I have taken you fully
into my confidence now, Mr. Hatherley, and I have shown you how I
trust you.' He rose as he spoke. 'I shall expect you, then, at
Eyford at 11:15.'

"'I shall certainly be there.'

"'And not a word to a soul.' He looked at me with a last long,
questioning gaze, and then, pressing my hand in a cold, dank
grasp, he hurried from the room.

"Well, when I came to think it all over in cool blood I was very
much astonished, as you may both think, at this sudden commission