Acknowledging, as I did, nothing but purely scientific methods,--convinced that nothing could be reached but through all the intervening steps fixed by Nature between Reason and Truth,--I should, at any other than such a weary time, have forgotten the vision in an hour. But now it took a deeper hold on my imagination. That my father should be associated in my dream with these experiments was natural; the glass plate which he had held was the same I was using; as for the phial, might it not be some old compound that I had known him or the daguerrotypist use, now casually spun out of the past and woven in with my present pursuits? Nevertheless, I was glad to shove aside this rationalistic interpretation: on the verge of drowning, I magnified the straw to a lifeboat, and caught at it. I pardoned myself for going to the shelves which still held my father's medicines, and examining each of the phials there. But when I turned away without finding one which at all answered to my dream, I felt mean and miserable; deeply disappointed at not having found the phial, I was ashamed at my retrogression to ages which dealt with incantations, and luck, and other impostures. I was shamed to the conclusion that the phial with its blue liquid was something I had read of in the curious old books which my father had hidden away from me, and which, strange to say, I had never been able to find since his death. Whilst I was meditating thus, there was a knock at my door, and a drayman entered with a chest, which he said had belonged to my father, and had been by him deposited several years before with a friend who lived a few miles from our village. I could scarcely close and bolt the door after the man had departed; _as he brought in the chest, I had seen through the lid the phial with the blue liquid_. So certain was I of this, that before I opened it I went and withdrew my glass plate, repolished it, and made all ready for a final experiment. Opening the chest, I found the old books which had been abstracted, and a small medicine-box, in which was the phial seen in my dream. But now the question arose, How was the blue fluid to be applied? I had not looked closely at the plate which my father held to see whether it was already prepared for an impression; and so I was at a loss to know whether this new fluid was to prepare the glass with a more perfect polish, or to mingle with the subtile nitrate itself. Unfortunately I tried the last first, and there was no result at all,--except the destruction of a third of the precious fluid. Cleaning the plate perfectly, I burnt into it, drop by drop, the whole of the contents of the phial. As I drained the last drop from it, it reddened on the glass as if it were the last drop of my heart's blood poured out.