Yet long before Colonel Wragge had turned to stare about the room, and long before the doctor had confirmed my impression that things were at last beginning to stir, I had become aware in most singular fashion that the place held more than our three selves. With the rising of the wind this increase to our numbers had first taken place. The baying of the hounds almost seemed to have signalled it. I cannot say how it may be possible to realise that an empty place has suddenly become⁠—not empty, when the new arrival is nothing that appeals to any one of the senses; for this recognition of an “invisible,” as of the change in the balance of personal forces in a human group, is indefinable and beyond proof. Yet it is unmistakable. And I knew perfectly well at what given moment the atmosphere within these four walls became charged with the presence of other living beings besides ourselves. And, on reflection, I am convinced that both my companions knew it too.