The policeman sighed and shook his head.

“I know,” he said solemnly, “I know I am not worthy.”

“But why did you join the police?” asked Syme with rude curiosity.

“For much the same reason that you abused the police,” replied the other. “I found that there was a special opening in the service for those whose fears for humanity were concerned rather with the aberrations of the scientific intellect than with the normal and excusable, though excessive, outbreaks of the human will. I trust I make myself clear.”“If you mean that you make your opinion clear,” said Syme, “I suppose you do. But as for making yourself clear, it is the last thing you do. How comes a man like you to be talking philosophy in a blue helmet on the Thames embankment?”

“You have evidently not heard of the latest development in our police system,” replied the other. “I am not surprised at it. We are keeping it rather dark from the educated class, because that class contains most of our enemies. But you seem to be exactly in the right frame of mind. I think you might almost join us.”

“Join you in what?” asked Syme.

“I will tell you,” said the policeman slowly. “This is the situation: The head of one of our departments, one of the most celebrated detectives in Europe, has long been of opinion that a purely intellectual conspiracy would soon threaten the very existence of civilisation. He is certain that the scientific and artistic worlds are silently bound in a crusade against the Family and the State. He has, therefore, formed a special corps of policemen, policemen who are also philosophers. It is their business to watch the beginnings of this conspiracy, not merely in a criminal but in a controversial sense. I am a democrat myself, and I am fully aware of the value of the ordinary man in matters of ordinary valour or virtue. But it would obviously be undesirable to employ the common policeman in an investigation which is also a heresy hunt.”

Syme’s eyes were bright with a sympathetic curiosity.

“What do you do, then?” he said.

“The work of the philosophical policeman,” replied the man in blue, “is at once bolder and more subtle than that of the ordinary detective. The ordinary detective goes to pot-houses to arrest thieves; we go to artistic tea-parties to detect pessimists. The ordinary detective discovers from a ledger or a diary that a crime has been 

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