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 the possessor of a favourite dog, which I should describe roughly as being larger than a terrier and smaller than a mastiff.”

I laughed incredulously as Sherlock Holmes leaned back in his settee and blew little wavering rings of smoke up to the ceiling.

“As to the latter part, I have no means of checking you,” said I, “but at least it is not difficult to find out a few particulars about the man’s age and professional career.”

From my small medical shelf I took down the Medical Directory and turned up the name. There were several Mortimers, but only one who could be our visitor. I read his record aloud.

“Mortimer, James, M.R.C.S., 1882, Grimpen, Dartmoor, Devon. House-surgeon, from 1882 to 1884, at Charing Cross Hospital. Winner of the Jackson Prize for Comparative Pathology, with essay entitled ‘Is Disease a Reversion?’ Corresponding member of the Swedish Pathological Society. Author of ‘Some Freaks of Atavism’