But the cat, too, had heard that dreadful bark; and it, too, had understood. This was more than it had bargained for. Across the dim shadows of that haunted room there must have passed some secret signal of distress between the animals. Smoke stood up and looked swiftly about him. He uttered a piteous meow and trotted smartly away into the greater darkness by the windows. What his object was only those endowed with the spirit-like intelligence of cats might know. But, at any rate, he had at last ranged himself on the side of his friend. And the little beast meant business.

At the same moment the collie managed to gain the door. The doctor saw him rush through into the hall like a flash of yellow light. He shot across the oilcloth, and tore up the stairs, but in another second he appeared again, flying down the steps and landing at the bottom in a tumbling heap, whining, cringing, terrified. The doctor saw him slink back into the room again and crawl round by the wall towards the cat. Was, then, even the staircase occupied? Did They stand also in the hall? Was the whole house crowded from floor to ceiling?

The thought came to add to the keen distress he felt at the sight of the collie’s discomfiture. And, indeed, his own personal distress had increased in a marked degree during the past minutes, and continued to increase steadily to the climax. He recognised that the drain on his own vitality grew steadily, and that the attack was now directed against himself even more than against the defeated dog, and the too much deceived cat.

It all seemed so rapid and uncalculated after that—the events that took place in this little modern room at the top of Putney Hill between midnight and sunrise—that Dr. Silence was hardly able to follow and remember it all. It came about with such uncanny swiftness and terror; the light was so uncertain; the movements of the black cat so difficult to follow on the dark carpet, and the doctor himself so weary and taken by surprise—that he found it almost impossible to observe accurately, or to recall afterwards precisely what it was he had seen or in what order the incidents had taken place. He never could understand what defect of vision on his part made it seem as though the cat had duplicated itself at first, and then increased indefinitely, so that there were at least a dozen of them darting silently about the floor, leaping softly on to chairs and tables, passing like shadows from the open door to the end of the room, all black as sin, with brilliant green eyes flashing fire in all directions. It was like the reflections from a score of mirrors placed round the walls at different angles. Nor could he make out at the time why the size of the room seemed to have altered, grown much larger, and why it extended away behind him where ordinarily the wall should have been. The snarling of the enraged and terrified collie sounded sometimes so far away; the ceiling seemed to have raised itself so much higher than before, and much of the furniture had changed in appearance and shifted marvellously.

It was all so confused and confusing, as though the little room he knew had become merged and transformed into the dimensions of quite another chamber, that came to him, with its host of cats and its strange distances, in a sort of vision.

But these changes came about a little later, and at a time when his attention was so concentrated upon the proceedings of Smoke and the collie, that he only observed them, as it were, subconsciously. And the excitement, the flickering candlelight, the distress he felt for the collie, and the distorting atmosphere of fog were the poorest possible allies to careful observation.

At first he was only aware that the dog was repeating his short dangerous bark from time to time, snapping viciously at the empty air, a foot or so from the ground. Once, indeed, he sprang upwards and forwards, working furiously with teeth and paws, and with a noise like wolves fighting, but only to dash back the next minute against the wall behind him. Then, after lying still for a bit, he rose to a crouching position as though to spring again, snarling horribly and making short half-circles with lowered head. And Smoke all the while meowed piteously by the window as though trying to draw the attack upon himself.

Then it was that the rush of the whole dreadful business seemed to turn aside from the dog and direct itself upon his own person. The collie had made another spring and fallen back with a crash into the corner, where he made noise enough in his savage rage to waken the dead before he fell to whining and then finally lay still. And directly afterwards the doctor’s own distress became intolerably acute. He had made a half movement forward to come to the rescue when a veil that was denser than mere fog seemed to drop down over the scene, draping room, walls, animals and fire in a mist of darkness and folding also about his own mind. Other forms moved silently across the field of vision, forms that he recognised from previous experiments, and welcomed not. Unholy thoughts began to crowd into his brain, sinister suggestions of evil presented themselves seductively. Ice seemed to settle about his heart, and his mind trembled. He began to lose memory—memory of his identity, of where he was, of what he ought to do. The very foundations of his strength were shaken. His will seemed paralysed.

And it was then that the room filled with this horde of cats, all dark as the night, all silent, all with lamping eyes of green fire. The dimensions of the place altered and shifted. He was in a much larger space. The whining of the dog sounded far away, and all about him the cats flew busily to and fro, silently playing their tearing, rushing game of evil, weaving the pattern of their dark purpose upon the floor. He strove hard to collect himself and remember the words of power he had made use of before in similar dread positions where his dangerous practice had sometimes led; but he could recall nothing consecutively; a mist lay over his mind and memory; he felt dazed and his forces scattered. The deeps within were too troubled for healing power to come out of them.

It was glamour, of course, he realised afterwards, the strong glamour thrown upon his imagination by some powerful personality behind the veil; but at the time he was not sufficiently aware of this and, as with all true glamour, was unable to grasp where the true ended and the false began. He was caught momentarily in the same vortex that had sought to lure the cat to destruction through its delight, and threatened utterly to overwhelm the dog through its terror.