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 &#160;WENT home with a feeling of exultation. My scheme had succeeded far better than I could possibly have hoped. Lord Nasby had been positively genial. It only now remained for me to "Make good," as he expressed it. Once locked in my own room, I took out my precious piece of paper and studied it attentively. Here was the clue to the mystery.

To begin with, what did the figures represent? There were five of them, and a dot after the first two. "Seventeen—one hundred and twenty-two," I murmured.

That did not seem to lead to anything.

Next I added them up. That is often done in works of fiction and leads to surprising deductions.

"One and seven make eight and one is nine and two are eleven and two are thirteen."

Thirteen! Fateful number! Was this a warning to me to leave the whole thing alone? Very possibly. Anyway, except as a warning, it seemed to be singularly useless. I declined to believe that any conspirator would take that way of writing thirteen in real life. If he meant thirteen, he would write thirteen. "13"—like that.

There was a space between the one and the two. I accordingly subtracted twenty-two from a hundred and seventy-one. The result was a hundred and fifty-nine. I did it again and made it a hundred and forty-nine. These arithmetical exercises were doubtless excellent practice, but as regarded the solution of the mystery, they seemed totally ineffectual. I left arithmetic alone, not attempting fancy division or multiplication, and went on to the words. Rh