Sherlock Holmes primarily relies on abduction: inferring an explanation for observed details. "From a drop of water", he writes, "a logician could infer the possibility of an Atlantic or a Niagara without having seen or heard of one or the other". In "A Scandal in Bohemia", Holmes infers that Watson had got wet lately and had "a most clumsy and careless servant girl". When Watson asks how Holmes knows this, the detective answers: In the first Holmes story, "A Study in Scarlet", Dr. Watson compares Holmes to C. Auguste Dupin, Edgar Allan Poe's fictional detective, who employed a similar methodology. Alluding to
Louis Ellies Dupin Louis Ellies Dupin Louis Ellies du Pin, or Dupin (17 June 1657 – 6 June 1719) was a French ecclesiastical historian, who was responsible for the "Nouvelle bibliothèque des auteurs ecclésiastiques " Dupin was born at Paris, coming from a noble family of Normandy. His mother, a Vitart, was the niece of Marie des Moulins, grandmother of the poet Jean Racine. When ten years old he entered the college of Harcourt, where he graduated M.A. in 1672. At the age of twenty Dupin accompanied Racine, who made a visit to Nicole for the purpose of becoming reconciled to the gentlemen