What can you tell of a man by the shoes he steps out in? If possessed with the analytic prowess of Sherlock Holmes then ‘a little reddish mould adhering to your instep’ might be all it takes to tell that your long-suffering companion Watson has been to the Post Office on Wigmore Street where ‘they have taken up the pavement and thrown up some earth, which lies in such a way that it is difficult to avoid treading in it on entering.’1
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