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 body which permits all rays of light to pass through,” he defined for me. “That is what I am seeking. Lloyd blunders up against the shadow with his perfect opaqueness. But I escape it. A transparent body casts no shadow; neither does it reflect light-waves—that is, the perfectly transparent does not. So, avoiding high lights, not only will such a body cast no shadow, but, since it reflects no light, it will also be invisible.”
We were standing by the window at another time. Paul was engaged in polishing a number of lenses, which were ranged along the sill. Suddenly, after a pause in the conversation, he said, “Oh! I’ve dropped a lens. Stick your head out, old man, and see where it went to.”
Out I started to thrust my head, but a sharp blow on the forehead caused me to recoil. I rubbed my bruised brow and gazed with reproachful inquiry at Paul, who was laughing in gleeful, boyish fashion.
“Well?” he said.
“Well?” I echoed.
“Why don’t you investigate?” he demanded. And investigate I did. Before thrusting out my head, my senses, automatically active, had told me there was nothing there, that nothing intervened between me and out-of-doors, that the aperture of the window opening was utterly empty. I stretched forth my hand and felt a hard object, smooth and cool and flat, which my touch, out of its experience, told me to be glass. I looked again, but could see positively nothing.
“White quartzose sand,” Paul rattled off, “sodic carbonate, slaked lime, cutlet, manganese peroxide—there you have it, the finest French plate glass, made by the great St. Gobain Company, who made the finest plate glass in the world, and this is the finest piece they ever made. It cost a king’s ransom. But look at it I You can’t see it. You don’t know it’s there till you run your head against it.
“Eh, old boy! That’s merely an object-lesson—certain elements, in themselves opaque, yet so compounded as to give a resultant body which is transparent. But that is a matter of inorganic chemistry, you say. Very true. But I dare to assert, standing here on my two feet, that in the organic I can duplicate whatever occurs in the inorganic.
“Here!” He held a test-tube between me and the light, and I noted the cloudy or muddy liquid it contained. He emptied the contents of another test-tube into it, and almost instantly it became clear and sparkling.
“Or here!” With quick, nervous movements among his array of test-tubes, he turned a white solution to a wine color, and a light yellow solution to a dark brown. He dropped a piece of litmus paper into an acid, when it changed instantly to red, and on floating it in an alkali it turned as quickly to blue.
“The litmus paper is still the litmus paper,” he enunciated in the formal manner of the lecturer. “I have not changed it into something else. Then what did I do? I merely changed the arrangement of its molecules. Where, at first, it absorbed all colors from the light but red, its molecular structure was so changed that it absorbed red and all colors except blue. And so it goes, AD INFINITUM. Now, what I purpose to do is this.” He paused for a space. “I purpose to seek—ay, and to find—the proper reagents, which, acting upon the living organism, will bring about molecular changes analogous to those you have just witnessed. But these reagents, which I shall find, and for that matter, upon which I already have my hands, will not turn the living body to blue or red or black, but they will turn it to transparency. All light will pass through it. It will be invisible. It will cast no shadow.”
A few weeks later I went hunting with Paul. He had been promising me for some time that I should have the pleasure of shooting over a wonderful dog—the most wonderful dog, in fact, that ever man shot over, so he averred, and continued to aver till my curiosity was aroused. But on the morning in question I was disappointed, for there was no dog in evidence.
“Don’t see him about,” Paul remarked unconcernedly, and we set off across the fields.
I could not imagine, at the time, what was ailing me, but I had a feeling of some impending and deadly illness. My nerves were all awry, and, from the astounding tricks they played me, my senses seemed to have run riot. Strange sounds disturbed me. At times I heard the swish-swish of grass being shoved aside, and once the patter of feet across a patch of stony ground.
“Did you hear anything, Paul?” I asked once.
But he shook his head, and thrust his feet steadily forward.
While climbing a fence, I heard the low, eager whine of a dog, apparently from within a couple of feet of me; but on looking about me I saw nothing.
I dropped to the ground, limp and trembling.
“Paul,” I said, “we had better return to the house. I am afraid I am going to be sick.”
“Nonsense, old man,” he answered. “The sunshine has gone to your head like wine. You’ll be all right. It’s famous weather.”
But, passing along a narrow path through a clump of cottonwoods, some object brushed against my legs and I stumbled and nearly fell. I looked with sudden anxiety at Paul.
“What’s the matter?” he asked. “Tripping over your own feet?”
I kept my tongue between my teeth and plodded on, though sore perplexed and thoroughly satisfied that some acute and mysterious malady had attacked my nerves. So far my eyes had escaped; but, when we got to the open fields again, even my vision went back on me. Strange flashes of vari-colored, rainbow light began to appear and disappear on the path before me. Still, I managed to keep myself in hand, till the vari-colored lights persisted for a space of fully twenty seconds, dancing and flashing in continuous play. Then I sat down, weak and shaky.
“It’s all up with me,” I gasped, covering my eyes with my hands. “It has attacked my eyes. Paul, take me home.”
But Paul laughed long and loud. “What did I tell you?—the most wonderful dog, eh? Well, what do you think?”
