We crawled and scraped through, and on over sharp stones till at last we could get no farther. We had evidently doubled back over the main cavern, and that we could not be far from the open air was shown by the presence of a bewildered bat, who flew to and fro in the confined space and hit us in the face several times. And in the extreme recess of this narrow branch a steady draught of air blew in through a crevice and nearly put the lights out. Through an oversight we found ourselves at this point reduced to two tapers and a bit, and to economise we kept only one alight at a time, so as to have enough for the return journey. All went well, however, and the sole difficulty we met with was in getting down over the wedged blocks in the big chamber, a climb that proved extremely awkward when taken the reverse way. In many parts of this cavern we noticed prodigious quantities of moths on the walls, as well as many huge spiders. But a more interesting thing was the vegetation naturalised in the caves, examples of which we found in other Mendip caverns as well. It will be advisable to have them examined by a botanical specialist. All I can say about them now is that they consist of extremely slender branching tendrils, some white and translucent, others brownish, thin as cotton. It was late in the afternoon when we entered the Roman Cavern; it was dark now, and the stars were out. Returning in advance of the others, I sat down just within the majestic gateway of the cavern, a flattened arch about 100 feet wide resting on enormous rocky jambs, and looked out across the deep wooded abyss where Cheddar lay, its lights reflected here and there by the dark waters of the mere, towards the craggy heights of Mendip opposite, just sinking down towards Sedgemoor. The Great Bear was shining brightly right in front--it almost spanned the breadth of the cave mouth; and the solemnity of the place and the hour could not but bring to mind the miserable fugitives who sat in this forlorn asylum, hemmed in by foes, and looked out on the same giant constellation thrice five hundred years ago. The place is admirably adapted for defence. A rear attack was of course impossible, whilst a frontal attack by way of the cliffs would be easily repelled; and a tolerable water-supply was to be found inside the cavern. The huge natural glacis of the fortress is covered to-day with a dense tangle of ivy and other climbers, through which we made our way heedfully, for a slip would have been easy in the dark, and a terrible fall the consequence.