It is evidently the theory of some arm-chair lounger who evolves all these neat little paradoxes in the seclusion of his own study.

It is not practical.

I should like to see him clapped down in a third class carriage on the Underground, and asked to give the trades of all his fellow-travellers.

I would lay a thousand to one against him." "You would lose your money," Sherlock Holmes remarked calmly.

"As for the article I wrote it myself." "You!" "Yes, I have a turn both for observation and for deduction.