Sherlock Holmes closed his eyes and placed his elbows upon the arms of his chair, with his finger-tips together. "The ideal reasoner," he remarked, "would, when he had once been shown a single fact in all its bearings, deduce from it not only all the chain of events which led up to it but also all the results which would follow from it.
Sherlock Holmes cerró los ojos y colocó los codos sobre los brazos de su butaca, juntando las puntas de los dedos. ––El razonador ideal ––comentó––, cuando se le ha mostrado un solo hecho en todas sus implicaciones, debería deducir de él no sólo toda la cadena de acontecimientos que condujeron al hecho, sino también todos los resultados que se derivan del mismo.