W. Stanley Jevons, a pupil of Augustus de Morgan, was a major figure in the field of logic and economics. He was at the University of Manchester from 1866-1876. He then became professor of political economy at University College London, resigning in 1880. The main book of this period was Studies and Exercises in Deductive Logic (1884). He simplified and corrected Boole's earlier work on logic. His first work, The Coal Question (1865), was written on coal distribution, attracted the attention of Gladstone, who was the first to make Jevons well-known in economics. His work on pure logic is very important. Jevons died by accidental drowning, probably the result of a heart attack, off the coast of Kent. The present work's chief purpose was the promotion of practical training in logic.