Within a year or so an aged stock-broker, named Bancroft, was robbed on the street of one hundred thousand dollars in securities. Inside of fifty-five minutes after he had reported his loss a detective agency had notified all banks, brokers, and the police in _fifty-six_ cities of the United States and Canada. The telephone is the modern detective’s chief ally, and he relies upon rapidity more than upon deduction. Under present conditions it is easier to overtake a crook than to reason out what he will probably do. In fact, the old-fashioned “deductive detective” is largely a man of the past. The most useless operator in the world is the one who is “wedded to his own theory” of the case—the man who asks no questions and relies only on himself. Interject a new element into a case and such a man is all at sea. In the meantime the criminal has made his “get away.” In the story books your detective scans with eagle eye the surface of the floor for microscopic evidences of crime. His mind leaps from a cigar ash to a piece of banana peel and thence to what the family had for dinner. His brain is working all the time. His gray matter dwarfs almost to insignificance that of Daniel Webster or the Hon. Benjamin F. Butler. It is, of course, all quite wonderful and most excellent reading, and the old-style sleuth really thought he could do it! Nowadays, while the fake detective is snooping around the back piazza with a telescope, the real one is getting the “dope” from the village blacksmith or barber (if there is any except on Saturday nights) or the girl that slings the pie at the station. These folk have something to _go_ on. They may not be highly intelligent, but they know the country, and, what is more important, they know the people. All the brains in the world cannot make up for the lack of an elementary knowledge of the place and the characters themselves. It stands to reason that no strange detective could form as good an opinion as to which of the members of your household would be most likely to steal a piece of jewelry as you could yourself. Yet the old-fashioned Sherlock knew and knows it all.