chemical apparatus of apparently simple construction, but quite unfamiliar to me.
We got under way just as formerly, and we moved rapidly towards the western end of the valley. I reckon that it was two miles, or perhaps a little more, from the eastern to the western extremity. The valley was bounded all round by hills. But I seemed to see to-day more than ever before an air of artificial construction about these. From some points of view this disappeared altogether, while from other points the evidence of it was all but conclusive. I made sure sometimes that I could detect the junction of a great embankment with the hills on either side, but in each case after I had got another view I was not quite so sure. Just the same impression, as I have told you, was produced on me by the view of the hills when I first approached them from the east; but the appearance or impression of artificial construction was very much stronger now.
I had on this day a very full view of the arrangement of the valley from end to end. You remember the large square in which on the second day we had seen the men drilled, and in which on the day after we had witnessed our host's wonderful disappearance and reappearance. You remember also the broad walk
