you suggest any way in which he can have concealed a store of the drug?"

I stood up and looked him straight in the face; it was the first chance
I had had of inspecting him by any but the feeblest light, and I looked
at him very attentively. Now, it is a curious fact--though one that most
persons must have observed--that there sometimes occurs a considerable
interval between the reception of a visual impression and its complete
transfer to the consciousness. A thing may be seen, as it were,
unconsciously, and the impression consigned, apparently, to instant
oblivion; and yet the picture may be subsequently revived by memory with
such completeness that its details can be studied as though the object
were still actually visible.

Something of this kind must have happened to me now. Preoccupied as I
was, by the condition of the patient, the professional habit of rapid
and close observation caused me to direct a searching glance at the man
before me. It was only a brief glance--for Mr. Weiss, perhaps
embarrassed by my keen regard of him, almost immediately withdrew into
the shadow--and my attention seemed principally to be occupied by the
odd contrast between the pallor of his face and the redness of his nose
and by the peculiar stiff, bristly character of his eyebrows. But there
was another fact, and a very curious one, that was observed by me
subconsciously and instantly forgotten, to be revived later when I
reflected on the events of the night. It was this:

As Mr. Weiss stood, with his head slightly turned, I was able to look
through one glass of his spectacles at the wall beyond. On the wall was
a framed print; and the edge of the frame, seen through the
spectacle-glass, appeared quite unaltered and free from distortion,
magnification or reduction, as if seen through plain window-glass; and