“Ha!” cried Gregson, in a relieved voice; “you should never neglect a chance, however small it may seem.”

“To a great mind, nothing is little,” remarked Holmes, sententiously.

“Well, I went to Underwood, and asked him if he had sold a hat of that size and description. He looked over his books, and came on it at once. He had sent the hat to a Mr. Drebber, residing at Charpentier’s Boarding Establishment, Torquay Terrace. Thus I got at his address.”

“Smart⁠—very smart!” murmured Sherlock Holmes.