wrote a letter to Miss Anita telling her that I had undertaken the task at once on her suggestion and that I surmised that the method of secret writing adopted if any, was probably a variant of the Biliteral cipher. I therefore sent her my own monograph on the subject so that if she chose she might study it and be prepared to go into the matter when we met. I studiously avoided saying anything which might frighten her or make any barrier between us; matters were shaping themselves too clearly for me to allow myself to fall into the folly of over-precipitation. It was only when I had placed the letter with its enclosure in the envelope and written Marjory's—Miss Anita's—name that I remembered that I had not got her address. I put it in my pocket to keep for her till we should meet on Tuesday.
When I resumed my work I began on the two remaining exhibits. The first was a sheaf of some thirty pages torn out of some black-letter law-book. The only remarkable thing about it was that every page seemed covered with dots—hundreds, perhaps thousands on each page. The second was quite different: a narrow slip of paper somewhat longer than a half sheet of modern note paper, covered with an endless array of figures in even lines, written small and with exquisite care. The paper was just such a size as might be put as marker in an ordinary quarto; that it had been so used was manifest by the discolouration of a portion of it that had evidently stuck out at the top of the volume. Fortunately, in its long dusty rest in the bookshelf the side written on had been downward so that the figures, though obscured by dust and faded by light and exposure to the air, were still decipherable. This paper I examined most carefully with a microscope; but could see in it no signs of secret writing beyond what might be contained in the disposition of the numbers themselves. I got a sheet of foolscap and made
