Deteckating

„Of course, I got to start in small. I can’t hope to pull off a wire-tapping game right at the start, because that has to have a gang. You don’t know anybody you could recommend for a gang, do you?“

„Not right offhand,“ said Mr. Gubb thoughtfully. … „I need all my time to study,“ said Mr. Gubb. „It aint’t easy to learn deteckating by mail.“
Ellis Parker Butler, Philo Gubb, The Correspondence School Detective, 1913

http://onlinebooks.library.upenn.edu/webbin/gutbook/lookup?num=29721