"I have said that the scrap was parchment, and not paper. Parchment is durable--almost imperishable. Matters of little moment are rarely consigned to parchment; since, for the mere ordinary purposes of drawing or writing, it is not nearly so well adapted as paper. This reflection suggested some meaning--some relevancy--in the death's-head. I did not fail to observe, also, the _form_ of the parchment. Although one of its corners had been, by some accident, destroyed, it could be seen that the original form was oblong. It was just such a slip, indeed, as might have been chosen for a memorandum--for a record of something to be long remembered and carefully preserved." "But," I interposed, "you say that the skill was not upon the parchment when you made the drawing of the beetle. How then do you trace any connection between the boat and the skull---since this latter, according to your own admission, must have been designed (God only knows how or by whom) at some period subsequent to your sketching the _scarabaeus_?" "Ah, hereupon turns the whole mystery; although the secret, at this point, I had comparatively little difficulty in solving. My steps were sure, and could afford but a single result I reasoned, for example, thus: When I drew the _scarabaeus_, there was no skull apparent upon the parchment When I had completed the drawing I gave it to you, and observed you narrowly until you returned it. You, therefore, did not design the skull, and no one else was present to do it. Then it was not done by human agency. And nevertheless it was done.