He observed them closely. The fog was thick in the air, and the tobacco smoke from his pipe added to its density; the furniture at the far end stood mistily, and where the shadows congregated in hanging clouds under the ceiling, it was difficult to see clearly at all; the lamplight only reached to a level of five feet from the floor, above which came layers of comparative darkness, so that the room appeared twice as lofty as it actually was. By means of the lamp and the fire, however, the carpet was everywhere clearly visible.
The animals made their silent tour of the floor, sometimes the dog leading, sometimes the cat; occasionally they looked at one another as though exchanging signals; and once or twice, in spite of the limited space, he lost sight of one or other among the fog and the shadows. Their curiosity, it appeared to him, was something more than the excitement lurking in the unknown territory of a strange room; yet, so far, it was impossible to test this, and he purposely kept his mind quietly receptive lest the smallest mental excitement on his part should communicate itself to the animals and thus destroy the value of their independent behaviour.
They made a very thorough journey, leaving no piece of furniture unexamined, or unsmelt. Flame led the way, walking slowly with lowered head, and Smoke followed demurely at his heels, making a transparent pretence of not being interested, yet missing nothing. And, at length, they returned, the old collie first, and came to rest on the mat before the fire. Flame rested his muzzle on his master's knee, smiling beatifically while he patted the yellow head and spoke his name; and Smoke, coming a little later, pretending he came by chance, looked from the empty saucer to his face, lapped up the milk when it was given him to the last drop, and then sprang upon his knees and curled round for the sleep it had fully earned and intended to enjoy.
Silence descended upon the room. Only the breathing of the dog upon the mat came through the deep stillness, like the pulse of time marking the minutes; and the steady drip, drip of the fog outside upon the window-ledges dismally testified to the inclemency of the night beyond. And the soft crashings of the coals as the fire settled down into the grate became less and less audible as the fire sank and the flames resigned their fierceness.
It was now well after eleven o'clock, and Dr. Silence devoted himself again to his book. He read the words on the printed page and took in their meaning superficially, yet without starting into life the correlations of thought and suggestions that should accompany interesting reading. Underneath, all the while, his mental energies were absorbed in watching, listening, waiting for what might come. He was not over-sanguine himself, yet he did not wish to be taken by surprise. Moreover, the animals, his sensitive barometers, had incontinently gone to sleep.
After reading a dozen pages, however, he realised that his mind was really occupied in reviewing the features of Pender's extraordinary story, and that it was no longer necessary to steady his imagination by studying the dull paragraphs detailed in the pages before him. He laid down his book accordingly, and allowed his thoughts to dwell upon the features of the Case. Speculations as to the meaning, however, he rigorously suppressed, knowing that such thoughts would act upon his imagination like wind upon the glowing embers of a fire.
As the night wore on the silence grew deeper and deeper, and only at rare intervals he heard the sound of wheels on the main road a hundred yards away, where the horses went at a walking pace owing to the density of the fog. The echo of pedestrian footsteps no longer reached him, the clamour of occasional voices no longer came down the side street. The night, muffled by fog, shrouded by veils of ultimate mystery, hung about the haunted villa like a doom. Nothing in the house stirred. Stillness, in a thick blanket, lay over the upper storeys. Only the mist in the room grew more dense, he thought, and the damp cold more penetrating. Certainly, from time to time, he shivered.
The collie, now deep in slumber, moved occasionally,—grunted, sighed, or twitched his legs in dreams. Smoke lay on his knees, a pool of warm, black fur, only the closest observation detecting the movement of his sleek sides. It was difficult to distinguish exactly where his head and body joined in that circle of glistening hair; only a black satin nose and a tiny tip of pink tongue betrayed the secret.
Dr. Silence watched him, and felt comfortable. The collie's breathing was soothing. The fire was well built, and would burn for another two hours without attention. He was not conscious of the least nervousness. He particularly wished to remain in his ordinary and normal state of mind, and to force nothing. If sleep came naturally, he would let it come—and even welcome it. The coldness of the room, when the fire died down later, would be sure to wake him again; and it would then be time enough to carry these sleeping barometers up to bed. From various psychic premonitions he knew quite well that the night would not pass without adventure; but he did not wish to force its arrival; and he wished to remain normal, and let the animals remain normal, so that, when it came, it would be unattended by excitement or by any straining of the attention. Many experiments had made him wise. And, for the rest, he had no fear.
Accordingly, after a time, he did fall asleep as he had expected, and the last thing he remembered, before oblivion slipped up over his eyes like soft wool, was the picture of Flame stretching all four legs at once, and sighing noisily as he sought a more comfortable position for his paws and muzzle upon the mat.
It was a good deal later when he became aware that a weight lay upon his chest, and that something was pencilling over his face and mouth. A soft touch on the cheek woke him. Something was patting him.
He sat up with a jerk, and found himself staring straight into a pair of brilliant eyes, half green, half black. Smoke's face lay level with his own; and the cat had climbed up with its front paws upon his chest.
The lamp had burned low and the fire was nearly out, yet Dr. Silence saw in a moment that the cat was in an excited state. It kneaded with its front paws into his chest, shifting from one to the other. He felt them prodding against him. It lifted a leg very carefully and patted his cheek gingerly. Its fur, he saw, was standing ridgewise upon its back; the ears were flattened back somewhat; the tail was switching sharply. The cat, of course, had wakened him with a purpose, and the instant he realised this, he set it upon the arm of the chair and sprang up with a quick turn to face the empty room behind him. By some curious instinct, his arms of their own accord assumed an attitude of defence in front of him, as though to ward off something that threatened his safety. Yet nothing was visible. Only shapes of fog hung about rather heavily in the air, moving slightly to and fro.
His mind was now fully alert, and the last vestiges of sleep gone. He turned the lamp higher and peered about him. Two things he became aware of at once: one, that Smoke, while excited, was pleasurably excited; the other, that the collie was no longer visible upon the mat at his feet. He had crept away to the corner of the wall farthest from the window, and lay watching the room with wide-open eyes, in which lurked plainly something of alarm.
Something in the dog's behaviour instantly struck Dr. Silence as unusual, and, calling him by name, he moved across to pat him. Flame got up, wagged his tail, and came over slowly to the rug, uttering a low sound that was half growl, half whine. He was evidently perturbed about something, and his master was proceeding to administer comfort when his attention was suddenly drawn to the antics of his other four-footed companion, the cat.
And what he saw filled him with something like amazement.
Smoke had jumped down from the back of the arm-chair and now occupied the middle of the carpet, where, with tail erect and legs stiff as ramrods, it was steadily pacing backwards and forwards in a narrow space, uttering, as it did so, those curious little guttural sounds of pleasure that only an animal of the feline species knows how to make expressive of supreme happiness. Its stiffened legs and arched back made it appear larger than usual, and the black visage wore a smile of beatific joy. Its eyes blazed magnificently; it was in an ecstasy.
At the end of every few paces it turned sharply and stalked back again along the same line, padding softly, and purring like a roll of little muffled drums. It behaved precisely as though it were rubbing against the ankles of some one who remained invisible. A thrill ran down the doctor's spine as he stood and stared. His experiment was growing interesting at last.
He called the collie's attention to his friend's performance