Since the cage was latticed and brightly illuminated, we had a clear view of the strata which we passed. I was conscious of each of them as we flashed past. There were the sallow lower chalk, the coffee-coloured Hastings beds, the lighter Ashburnham beds, the dark carboniferous clays, and then, gleaming in the electric light, band after band of jet-black, sparkling coal alternating with the rings of clay. Here and there brickwork had been inserted, but as a rule the shaft was self-supported, and one could but marvel at the immense labour and mechanical skill which it represented. Beneath the coal-beds I was conscious of jumbled strata of a concrete-like appearance, and then we shot down into the primitive granite, where the quartz crystals gleamed and twinkled as if the dark walls were sown with the dust of diamonds. Down we went and ever down – lower now than ever mortals had ever before penetrated. The archaic rocks varied wonderfully in colour, and I can never forget one broad belt of rose-coloured felspar, which shone with an unearthly beauty before our powerful lamps. Stage after stage, and lift after lift, the air getting ever closer and hotter until even the light tussore garments were intolerable and the sweat was pouring down into those rubber-soled slippers. At last, just as I was thinking that I could stand it no more, the last lift came to a stand and we stepped out upon a circular platform which had been cut in the rock. I noticed that Malone gave a curiously suspicious glance round at the walls as he did so. If I did not know him to be amongst the bravest of men, I should say that he was exceedingly nervous.