Was I to be imprisoned here till the light came, and then hurried out to such a fate as I had seen dealt to another of their captives? Or did the stealthy movement above me imply an even nearer menace? I raised the axe, and brought it down with all my force on the door, in the hope that it would split beneath it, and careless of the noise I made. Noise there was in the narrow chamber and beyond it also, as I was soon to learn; but the door did not even shake to the blow. It was of so hard a substance, whether of wood or metal, that I realised that it would be the axe-edge only which would suffer should I continue. The movements overhead were louder now, and I had the impression that something was about to spring down from the darkness. The fear of the unknown was upon me, which is of all fears the most dreadful. CHAPTER XIX THE DUEL IN THE NIGHT I think we do less than justice to the alchemists of the dark ages of Europe, and to their opponents also. We are accustomed to regard them as charlatans, and to brand those as superstitious fools who burnt them. There is a folly of credulity, but there is a folly of incredulity, which is far greater. If they asked their patrons for money which would enable them to turn lead into gold, the scientist of to-day is approaching the same point of research which they must have reached when the possibility dawned upon them. Perhaps his own progress would have been more rapid had he been readier to assume that their theories were deserving of as much respect as his own. It is not many years since it was announced as a momentous discovery that bubonic plague is distributed by rats. This was known to the Egyptian priesthood, and the information was available in one of the oldest books in the world for any one who cared to read it. But that was a superstition only! No doubt there are other “superstitions” in the same book which we shall believe when we have rediscovered them. On the other hand, it was realised by those among whom the alchemists practised that they were the repositories of an esoteric knowledge, the extent and power of which could be only dimly imagined, and of which there was no guarantee that it would be used beneficently. Even now, a scientist will present his fellow-men with a more nutritious infants’ food, or a deadlier poison-gas, than has been previously invented, with the same fatuous complacency. The evil eye may have been fact or imagination. I do not know. It is no more inherently improbable than wireless telegraphy.