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“‘Well,’ I answered. ‘That’s all right. But what good are they in the face of this emergency? Are you thinking of photographing anything now?’

“‘Perhaps. I haf been thinking some.’

“‘Have you thought out what that creature is–forward, there?’

“‘Partly. It is some creature thrown up from der bottom of der sea, und washed on board by der wave. Light, like wave motion, ends at a certain depth, you know; und we have over twelve thousand feet beneath us. At that depth dere is absolute darkness, but we know that creatures live down dere, und fight, und eat, und die.’

“‘But what of it? Why can’t we see that thing?’

“‘Because, in der ages that haf passed in its evolution from der original moneron, it has never been exposed to light–I mean visible light, der light that contains der seven colors of der spectrum. Hence it may not respond to der three properties of visible light–reflection, which would give it a color of some kind; absorption, which would make it appear black; or refraction, which, in der absence of der other two, would distort things seen through it. For it would be transparent, you know.’

“‘But what can be done?’ I asked helplessly, for I could not understand at the time what he meant.

“‘Nothing, except that der next man attacked must use his knife. If he cannot see der creature, he can feel it. Und perhaps–I do not know yet–perhaps, in a way, we may see it–its photograph.’

“I looked blankly at him, thinking he might have gone crazy, but he continued.

“‘You know,’ he said, ‘that objects too small to be seen by the microscope, because smaller than der amplitude of der shortest wave of visible light, can be seen when exposed to der ultraviolet light–der dark light beyond der spectrum? Und you know that this light is what acts der most in photography? That it exposes on a sensitized plate new stars in der heavens invisible to der eye through the strongest telescope?’

“‘Don’t know anything about it,’ I answered. ‘But if you can find a way out of this scrape we’re in, go ahead.’

“‘I must think,’ he said dreamily. ‘I haf a rock-crystal lens which is permeable to this light, und which I can place in mine camera. I must have a concave mirror, not of glass, which is opaque to this light, but of metal.’

“‘What for?’ I asked.

“‘To throw der ultraviolet light on der beast. I can generate it with mine static machine.’

“‘How will one of our lantern reflectors do? They are of polished tin, I think.’

“‘Good! I can repolish one.’

“We had one deck lantern larger than usual, with a metallic reflector that concentrated the light into a beam, much as do the present day searchlights. This I procured from the lazaret, and he pronounced it available. Then he disappeared, to tinker up his apparatus.

“Night came down, and I lighted three masthead lights, to hoist at the fore to inform any passing craft that we were not under command; but, as I would not send a man forward on that job, I went myself, carefully feeling my way with the pike pole. Luckily, I escaped contact with the creature, and returned to the poop, where we had a cold supper of canned cabin stores.

“The top of the house was dry, but it was cold, especially so as we were all drenched to the skin. The steward brought up all the blankets there were in the cabin–for even a wet blanket is better than none at all–but there were not enough to go around, and one man volunteered, against my advice, to go forward and bring aft bedding from the forecastle.

“He did not come back; we heard his yell, that finished with a gurgle; but in that pitch black darkness, relieved only by the red glow from the north, not one of us dared to venture to his rescue. We knew that he would be dead, anyhow, before we could get to him; so we stood watch, sharing the blankets we had when our time came to sleep.