"'Nay, there are even churchmen and prelates who would view it as magic. Therefore, my friend, seeing that, as you say, the powder is not likely to be of any use to man, I should say that it were best that you destroy it, for if whispers of it got abroad you might well be accused of dealing in magic. All knowledge of things beyond them is magic to the ignorant. Roger Bacon was treated as a magician, and I doubt not that this will ever be the case with all those who are more learned than their fellow-men. Therefore my advice to you is, burn the stuff and say naught about it.'
"I did not take his advice, Edgar, for it seemed to me that it might well be used to awe any unruly mob that might come hither at night to attack me. I have made an experiment that, though I believe not in the supernatural, would have frightened me had I seen it without knowing anything of its nature. You know that old skull that was dug up out of the garden last month, I have hung the lower jaw on wires so that it can be moved, and have to-day painted it, and now I will blow out the light again, and then take it from the cupboard."
A moment later the room was in darkness, and then an exclamation of surprise and almost terror rose from Edgar. In front of him there was a gibbering skull, the lower jaw wagging up and down, as if engaging in noiseless laughter, It was much more brilliant than the stone head had been, and a lambent flame played round it.
"It is not a pleasant object," his father said, quietly, as he struck the tinder and again lighted the lamp. "I fancy, Edgar, that if a mob of people were to break down the door and find themselves confronted by that object they would fly in terror."
"Assuredly they would, father; they would not stop running this side of Dartford. Even though I expected it, the sight sent a shiver through me, and my teeth well-nigh chattered. But this would only avail in case of a night attack."
"It would avail something even in daylight, Edgar. These downstairs rooms have but little light, and that little I intend to block up by nailing boards inside, and by hanging sacks over them outside. Then if I place the skull in the passage, those who sought me in my laboratory would be brought to a standstill. But there are other means. I have buried jars filled with Friar Bacon's powder round the house, with trains by which they can be fired. At present the common people know little of guns, and methinks that the explosion of two or three of these jars would send them about their business, I have other devices which it is not necessary to enter upon, but which would be effective, therefore you need have little fear that any mob will gain entrance here, and you may be sure that after a repulse they would be very loath to touch the place again."