But we could not penetrate the boudoir except by way of the drawing-room, the door of which had been locked on the inside by Mademoiselle Stangerson.

But even if I had had the free disposition of the boudoir, I should have held to the plan I had formed; because any other plan of attack would have separated us at the moment of the struggle with the man, while my plan united us all for the attack, at a spot which I had selected with almost mathematical precision,--the intersection of the two galleries.
"Having so placed my people, I again left the chateau, hurried to my ladder, and, replacing it, climbed up, revolver in hand.
"If there be any inclined to smile at my taking so many precautionary measures, I refer them to the mystery of The Yellow Room, and to all the proofs we have of the weird cunning of the murderer.

Further, if there be some who think my observations needlessly minute at a moment when they ought to be completely held by rapidity of movement and decision of action, I reply that I have wished to report here, at length and completely, all the details of a plan of attack conceived so rapidly that it is only the slowness of my pen that gives an appearance of slowness to the execution.

I have wished, by this slowness and precision, to be certain that nothing should be omitted from the conditions under which the strange phenomenon was produced, which, until some natural explanation of it is forthcoming, seems to me to prove, even better than the theories of Professor Stangerson, the Dissociation of Matter--I will even say, the instantaneous Dissociation of Matter.".