exist in the house; and what we want to find out is, where is that secret room? It must be a pretty good size—I mean much larger than a mere closet—because we know people used to lay hid there in old times." Sarah nodded, as much as to say that she had heard legends of the "priest's chamber." "Now, Sarah, the first thing we want to discover is the whereabouts of this room—and this can only be done in one way. I want the exact dimensions—that is to say, the measure, the height, length, and breadth, of every room, passage, closet, and staircase in the old part of the house; because as this room existed in the old time, it is only in the central part of the house, which was the original building, that the secret chamber need be looked for. When I have got all these measurements, and put them all down upon paper, I shall see where there is a space to fill up. Do you understand?"

Sarah did not quite understand; so I got a sheet of paper, drew a rough plan of a house, and explained the matter more fully.

Sarah understood now, and at once entered into it with all her heart.

"You see," I said, "we want the exact position of the doors, windows, and chimneys. Here is a small pocket-book and pencil: take one page for each room; mark down first in this way, the extreme length and breadth, then the positions of the doors and windows thus, and put 'in small figures' their distances from each other."

I then showed her a small plan of Harmer Place, which I had drawn from my recollection of it, and Sarah understood perfectly what she had to do.

"Make a notch the length of a yard on the handle of your broom," I said, "and measure the exact length of the bottom of your apron. With your broom you can get the height of the room, and with your apron the other measurements, so that you will be able to get all the sizes; and even if you are disturbed, no one would have the slightest idea of what you are doing."

I then asked her to measure the room we were in, and to make a little sort of plan of it, and I found her so quick and intelligent, that I felt certain she would execute her task with sufficient accuracy to enable us to find out where the secret room was situated.

The two girls then took their leave, and I really felt strong hope in the success of my plan—not indeed that it was mine, for it was Harry's idea entirely, and I only gave her the instructions he had previously given me.

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