iii) Is DR CHRISTOPH in "The Loathly Opposite", a story in The Runagates Club.
"Dr. Christoph had gone as medical officer in November '14 to the Ypres Salient with a Saxon regiment, and had spent the winter there. In '15 he had been in Champagne, and in the early months of '16 at Verdun, till he was invalided with rheumatic fever."
"I assumed that this home duty was medical, until he said something about getting rusty in his professional work. Then it appeared that it had been some job connected with Intelligence. 'I am reputed to have a little talent for mathematics,' he said. 'No. I am no mathematical scholar, but, if you understand me, I have a certain mathematical aptitude. My mind has always moved happily among numbers. Therefore I was set to construct and to interpret cyphers, a strange interlude in the noise of war. I sat in a little room and excluded the world, and for a little I was happy.'"
"I had a sudden inspiration.
"I took a sheet of note-paper from the stand, scribbled the word Reinmar on it, and shoved it towards him."
"But it was I who got the big surprise. He stopped thunderstruck, as soon as his eye caught the word, blushed scarlet over every inch of face and bald forehead, seemed to have difficulty in swallowing, and then gasped. 'How did you know?'"
Google Books and http://gutenberg.net.au/ebooks03/0301381h.html#c06
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"Dr. Christoph had gone as medical officer in November '14 to the Ypres Salient with a Saxon regiment, and had spent the winter there. In '15 he had been in Champagne, and in the early months of '16 at Verdun, till he was invalided with rheumatic fever."
"I assumed that this home duty was medical, until he said something about getting rusty in his professional work. Then it appeared that it had been some job connected with Intelligence. 'I am reputed to have a little talent for mathematics,' he said. 'No. I am no mathematical scholar, but, if you understand me, I have a certain mathematical aptitude. My mind has always moved happily among numbers. Therefore I was set to construct and to interpret cyphers, a strange interlude in the noise of war. I sat in a little room and excluded the world, and for a little I was happy.'"
"I had a sudden inspiration.
"I took a sheet of note-paper from the stand, scribbled the word Reinmar on it, and shoved it towards him."
"But it was I who got the big surprise. He stopped thunderstruck, as soon as his eye caught the word, blushed scarlet over every inch of face and bald forehead, seemed to have difficulty in swallowing, and then gasped. 'How did you know?'"
Google Books and
http://gutenberg.net.au/ebooks03/0301381h.html#c06