“You have heard me speak of Professor Moriarty?” “The famous scientific criminal, as famous among crooks as– –” “My blushes, Watson!” Holmes murmured in a deprecating voice. “I was about to say, as he is unknown to the public.” “A touch! A distinct touch!” cried Holmes. “You are developing a certain unexpected vein of pawky humour, Watson, against which I must learn to guard myself.”