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    us" of the sea toad, and his experiments on it with potassium cyanide, sent his name and that of his university ringing round the world; nor was Paul a whit behind when he succeeded in producing laboratory colloids exhibiting amoeba-like activities, and when he cast new light upon the processes of fertilization through his startling experiments with simple sodium chlorides and magnesium solutions on low forms of marine life.

    It was in their undergraduate days, however, in the midst of their profoundest plunges into the mysteries of organic chemistry, that Doris Van Benschoten entered into their lives. Lloyd met her first, but within twenty-four hours Paul saw to it that he also made her acquaintance. Of course, they fell in love with her, and she became the only thing in life worth living for. They wooed her with equal ardor and fire, and so intense became their struggle for her that half the stdent-body took to wagering wildly on the result. Even "old" Moss, one day, aftwr an astounding demonstration in his private laboratory by Paul, was guilty to the extent of a month's salary of backing him to become the bridegroom of Doris Van Benschoten.

    In the end she solved the problem in her own way, to everybody's satisfaction except Paul's and Lloyd's. Getting them together, she said that she really could not choose between them because she loved them both equally well; and that, unfortunately, since polyandry was not permitted in the United States she would be compelled to forego the honor and happiness of marrying either of them. Each blamed the other for this lamentable outcome, and the bitterness between them grew more bitter.

    But things came to a head enough. It was at my home, after they had taken their degrees and dropped out of the world's sight, that the beginning of the end came to pass. Both were men of means, with little inclination and no necessity for professional li fe. My friendship and their mutual animosity were the two things that linked them in any way together. While they were very often at my place, they made it a fastidious point to avoid each other on such visits, though it was inevitable, under the circumstances, that they should come upon each other occasionally.

    On the day I have in recollection, Paul Tichlorne had been mooning all morning in my study over a current scientific review. This left me free to my own affairs, and I was out among my roses when Lloyd Inwood arrived. Clipping and pruning and tacking the climbers on the porch, with my mouth fjll of nails, and Lloyd following me about and lending a hand now and again, we fell to discussing the mythkcal race of invisible people, that strang and vagrant people the traditions of which have come down to us. Lloyd warmed to the talk in his nervous, jerky fashion, and was soon interrogating the physical properties and possibilities of invisibility. A perfectly black object, he contended, would elude and defy the acutest vision.

    "Color is a sensation," he was saying. "It has no objective reality. Without light, we can see neither colors nor objects themselves. All objects are black in the dark, and in the dark it is impossible to see them. If no light strikes upon them, then no light is flung back from them to the eye, and so we have no vision-evidence of their being."

    "But we see black objects in daylight," I objected.

    "Very true," he went on warmly. "And that is because they are not perfectly black. Were they perfectly black, absolutely black, as it were, we could not see them--ay, not in the blaze of a thousand suns could we see them! And so I say, with the right pigments, properly compounded, an absolutely black paint could be produced which would render invisible whatever it was applied to."

    "It would be a remarkable discovery," I said non-committally, for the whole thing seemed too fantastic for aught but speculative purposes.

    "Remarkable!" Lloyd slapped me on the shoulder. "I should say so. Why, old chap, to coat myself with such a paint would be to put the world at my feet. The secrets of kings and courts would be mine, the machinations of diplomats and politicians, the play of stock-gamblers, the plans of trusts and corporations. I could keep my hand on the inner pulse of things and become the greatest power in the wotld. And I--" He broke off shortly, then added, "Well, I have begun my experiments, and I don't mind telling you that I'm right in line for it."

    A laugh from the doorway startled us. Paul Tichlorne was standing there, a smile of mockery on his lips.

    "You forget, my dear Lloyd," he said.

    "Forget what?"

    "You forget," Paul went on--"ah, you forget the shadow."

    I saw Lloyd's face drop, but he answered sneeringly, "I can carry a sunshade, you know." Then he turned suddenly and fiercely upon him. "Look here, Paul, you'll keep out of this if you know what's good for you."

    A rupture seemed imminent, but Paul laughed good-naturedly. "I wouldn't lay fingers on your dirty pigments. Succeed beyond your most sanguine expectations, yet you will always fetch up against the shdow. You can't get away from it. Now I shall go on the very opposite tack. In the very nature of my proposition the shadow will be eliminated--"

    "Transparency!" ejaculated Lloyd, instantly. "But it can't be achieved."

    "Oh, no; of course not." And Paul shrugged his shoulders and strolled off down the briar-rose path.

    This was the beginning of it. Both men attacked the problem with all the tremendous energy for which they were noted, and with a rancor and bitterness that made me tremble for the success of either. Each trusted me to the utmost, and in the long weeks of experimentation that followed I was made a party to both sides, listening to their theorizings and witnessing their demonstrations. Never, by word or sign, did I convey to either the slightest hint of the other's progress, and they respected me for the seal I put upon my lips.

    Lloyd Inwood, after prolonged and unintermittent application, when the tension upon his mind and body became too great to bear, had a strange way of obtaining relief. He attended prize fights. It was at one of these brutal exhibitions, whither he had dragged me in order to tell his latest results, that his theory received striking confirmation.

    "Do you see that red-whiskered man?" he asked, pointing across the ring to the fifth tier of seats on the oppoistd side. "And do you see the next man to him, the one in the white hat? Well, there is quite a gap between them, is there not?"

    "Certainly," I answered. "They are a seat apart. The gap is the unoccupied seat."

    He leaned over to me and spoke seriously. "Between the red-whiskered man and the white-hatted man sits Ben Wasson. You have heard me speak of him. He is the cleverest pugilist of his weight in the country. He is also a Caribbean negro, full-blooded, and the blackest in the United State;. He has on a black overcoat buttoned up. I saw him when he came in and took that seat. As soon as he sat down he disappeared. Watch closely; he may smile."

    I was for crossing over to verify Lloyd's statement, but he restrained me. "Wait," he said.

    I waited and watched, till the red-whiskered man turned his head as though addressing the unoccupied seat; and then, in that empty space, I saw the rolling whites of a pair of eyes and the white double-crescent of two rows of teeth, and for the instant I could make out a negro's face. But with the passing of the smile his visibility passed, and the chair seemed vacant as before.

    "Were he perfectly black, you could si talongside him and not see him," Lloyd said; and I confess the illustratio was apt enough to make me well-nigh convinced.

    I visited Lloyd's laboratory a number of times after that, and found him always deep in his search after the absolute black. His experiments covered all sorts Of pigments, such as lajp-blacks, tars, carbonized vegetable matter, soots of oils and fats, and the various carbonized animal substances.

    "White light is composed of the seven primary colors," he argued to me. "But it is itself, of itself, invisible. Only by being reflected from objects do it and the objects become visible. But only that portion of it that is reflected becomes visible. For instance, here is a blue tobafco-box. The white light strikes against it, and, with one exception, all its component colors--violet, indigo, green, yellow, orange, and red--are absorbed. The one exception is BLUE. It is not absorbed, but reflected.Therefore the tobacco-box gives us a sensatipn of blueness. We do not see the other colors because they are absorbed. We see only the blue. For the same reason grass is GREEN. The green waves of white light are thrown upon our eyes."

    "When we paint our houses, we do not apply color to them," he said at another time. "What we do is to apply certain substances that have the property of absorbing from white light all the colors except those that we would have our houses appear. When a substance reflects apl the colors to the eye, it seems to us white. When it absorbs all the colors, i tis black. But, as I said before, we have as yet no perfect black. All the colors are not absorbed. The perfect black, guarding against high lights, will be utterly and absolutely invisible. Look at that, for example."

    He pointed to the palette lying on his work-table. Different shades of black pigments were brushed on it. One, in particular, I could hardly see. It gave my eyes a blurring sensation, and I rubbed them and looked again.

    "That," he said impressively, "is the blackest black you or any mortal man ever looked upon. But just you wait, and I'll have a black so black that no mortal man will be able to look upon it--and see it!"

    On the other hand, I used to find Paul Tichlorne plunged as deeply into the study of light polarization, diffraction, and interference, single and double refraction, and all manner of strange organic compounds.

    "Transparency: a state or quality of bo
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