I had been lying with my face away from my uncle's chair, so that in this sudden flash of awakening I saw only the door to the street, the window, and the wall and floor and ceiling toward the north of the room, all photographed with morbid vividness on my brain in a light brighter than the glow of the fungi or the rays from the street outside. It was not a strong or even a fairly strong light; certainly not nearly strong enough to read an average book by. But it cast a shadow of myself and the cot on the floor, and had a yellowish, penetrating force that hinted at things more potent than luminosity. This I perceived with unhealthy sharpness despite the fact that two of my other senses were violently assailed. For on my ears rang the reverberations of that shocking scream, while my nostrils revolted at the stench which filled the place. My mind, as alert as my senses, recognized the gravely unusual; and almost automatically I leaped up and turned about to grasp the destructive instruments which we had left trained on the moldy spot before the fireplace. As I turned, I dreaded what I was to see; for the scream had been in my uncle's voice, and I knew not against what menace I should have to defend him and myself.  
Yet after all, the sight was worse than I had dreaded. There are horrors beyond horrors, and this was one of those nuclei of all dreamable hideousness which the cosmos saves to blast an accursed and unhappy few. Out of the fungus-ridden earth steamed up a vaporous corpse-light, yellow and diseased, which bubbled and lapped to a gigantic height in vague outlines half human and half monstrous, through which I could see the chimney and fireplace beyond. It was all eyes—wolfish and mocking—and the rugose insect-like head dissolved at the top to a thin stream of mist which curled putridly about and finally vanished up the chimney. I say that I saw this thing, but it is only in conscious retrospection that I ever definitely traced its damnable approach to form. At the time, it was to me only a seething, dimly phosphorescent cloud of fungous loathsomeness, enveloping and dissolving to an abhorrent plasticity the one object on which all my attention was focussed. That object was my uncle—the venerable Elihu Whipple—who with blackening and decaying features leered and gibbered at me, and reached out dripping claws to rend me in the fury which this horror had brought.
 
It was a sense of routine which kept me from going mad. I had drilled myself in preparation for the crucial moment, and blind training saved me. Recognizing the bubbling evil as no substance reachable by matter or material chemistry, and therefore ignoring the flame-thrower which loomed on my left, I threw on the current of the Crookes tube apparatus, and focussed toward that scene of immortal blasphemousness the strongest ether radiations which man's art can arouse from the spaces and fluids of nature. There was a bluish haze and a frenzied sputtering, and the yellowish phosphorescence grew dimmer to my eyes. But I saw the dimness was only that of contrast, and that the waves from the machine had no effect whatever.
 
Then, in the midst of that demoniac spectacle, I saw a fresh horror which brought cries to my lips and sent me fumbling and staggering toward that unlocked door to the quiet street, careless of what abnormal terrors I loosed upon the world, or what thoughts or judgments of men I brought down upon my head. In that dim blend of blue and yellow the form of my uncle had commenced a nauseous liquefaction whose essence eludes all description, and in which there played across his vanishing face such changes of identity as only madness can conceive. He was at once a devil and a multitude, a charnel-house and a pageant. Lit by the mixed and uncertain beams, that gelatinous face assumed a dozen—a score—a hundred—aspects; grinning, as it sank to the ground on a body that melted like tallow, in the caricatured likeness of legions strange and yet not strange.
 
I saw the features of the Harris line, masculine and feminine, adult and infantile, and other features old and young, coarse and refined, familiar and unfamiliar. For a second there flashed a degraded counterfeit of a miniature of poor mad Rhoby Harris that I had seen in the School of Design museum, and another time I thought I caught the raw-boned image of Mercy Dexter as I recalled her from a painting in Carrington Harris's house. It was frightful beyond conception; toward the last, when a curious blend of servant and baby visages flickered close to the fungous floor where a pool of greenish grease was spreading, it seemed as though the shifting features fought against themselves and strove to form contours like those of my uncle's kindly face. I like to think that he existed at that moment, and that he tried to bid me farewell. It seems to me I hiccupped a farewell from my own parched throat as I lurched out into the street; a thin stream of grease following me through the door to the rain-drenched sidewalk.
 
The rest is shadowy and monstrous. There was no one in the soaking street, and in all the world there was no one I dared tell. I walked aimlessly south past College Hill and the Athen?um, down Hopkins Street, and over the bridge to the business section where tall buildings seemed to guard me as modern material things guard the world from ancient and unwholesome wonder. Then gray dawn unfolded wetly from the east, silhouetting the archaic hill and its venerable steeples, and beckoning me to the place where my terrible work was still unfinished. And in the end I went, wet, hatless, and dazed in the morning light, and entered that awful door in Benefit Street which I had left ajar, and which still swung cryptically in full sight of the early householders to whom I dared not speak.
 
The grease wa............