Darwin's Theory of Evolution -- or Patrick Matthew's?

Writing at FiveThirtyEight, journalist Daniel Engber discusses the theory that Charles Darwin engaged in intellectual theft or plagiarism ("Who Will Debunk The Debunkers?"). Engber describes the investigations of criminologist Mike Sutton at Nottingham Trent University:

In the last few years, Sutton has himself embarked on another journey to the depths, this one far more treacherous than the ones he's made before. The stakes were low when he was hunting something trivial, the supermyth of Po...