"I returned to my room, washed, shaved and dressed, after which I read awhile. Then I went downstairs and got the acting butler to give me some sandwiches and a cup of coffee.
"Half an hour later I was heading for Burtontree, as hard as I could walk; for a sudden idea had come to me, which I was anxious to test. I reached the town a little before eight thirty, and found the local photographer with his shutters still up. I did not wait, but knocked until he appeared with his coat off, evidently in the act of dealing with his breakfast. In a few words I made clear that I wanted the use of his dark room immediately, and this he at once placed at my disposal.
"I had brought with me the slide which contained the plate that I had used with the flashlight, and as soon as I was ready I set to work to develop. Yet, it was not the plate which I had exposed, that I first put into the solution, but the second plate, which had been ready in the camera during all the time of my waiting in the darkness. You see, the lens had been uncapped all that while, so that the whole chancel had been, as it were, under observation.
"You all know something of my experiments in 'Lightless Photography,' that is, appreciating light. It was X-ray work that started me in that direction. Yet, you must understand, though I was attempting to develop this 'unexposed' plate, I had no definite idea of results—nothing more than a vague hope that it might show me something.
"Yet, because of the possibilities, it was with the most intense and absorbing interest that I watched the plate under the action of the developer. Presently I saw a faint smudge of black appear in the upper part, and after that others, indistinct and wavering of outline. I held the negative up to the light. The marks were rather small, and were almost entirely confined to one end of the plate, but as I have said, lacked definiteness. Yet, such as they were, they were sufficient to make me very excited and I shoved the thing quickly back into the solution.
"For some minutes further I watched it, lifting it out once or twice to make a more exact scrutiny, but could not imagine what the markings might represent, until suddenly it occurred to me that in one of two places they certainly had shapes suggestive of a cross hilted dagger. Yet, the shapes were sufficiently indefinite to make me careful not to let myself be overimpressed by the uncomfortable resemblance, though I must confess, the very thought was sufficient to set some odd thrills adrift in me.
"I carried development a little further, then put the negative into the hypo, and commenced work upon the other plate. This came up nicely, and very soon I had a really decent negative that appeared similar in every respect (except for the difference of lighting) to the negative I had taken during the previous day. I fixed the plate, then having washed both it and the 'unexposed' one for a few minutes under the tap, I put them into methylated spirits for fifteen minutes, after which I carried them into the photographer's kitchen and dried them in the oven.
"Whilst the two plates were drying the photographer and I made an enlargement from the negative I had taken by daylight. Then we did the same with the two that I had just developed, washing them as quickly as possible, for I was not troubling about the permanency of the prints, and drying them with spirits.
"When this was done I took them to the window and made a thorough examination, commencing with the one that appeared to show shadowy daggers in several places. Yet, though it was now enlarged, I was still unable to feel convinced that the marks truly represented anything abnormal; and because of this, I put it on one side, determined not to let my imagination play too large a part in constructing weapons out of the indefinite outlines.
"I took up the two other enlargements, both of the chancel, as you will remember, and commenced to compare them. For some minutes I examined them without being able to distinguish any difference in the scene they portrayed, and then abruptly, I saw something in which they varied. In the second enlargement—the one made from the flashlight negative—the dagger was not in its sheath. Yet, I had felt sure it was there but a few minutes before I took the photograph.