On the Variation of Species, with Especial Reference to the Insecta Followed by an Inquiry into the Nature of Genera

The Logic of Chance, 3rd edition An Essay on the Foundations and Province of the Theory of Probability, With Especial Reference to Its Logical Bearings and Its Application to Moral and Social Science and to Statistics

Variation in the Muscles and Nerves of the Leg in Two Genera of Grouse (Tympanuchus and Pedioecetes)

Where Half The World Is Waking Up The Old and the New in Japan, China, the Philippines, and India, Reported With Especial Reference to American Conditions

Some Historical Account of Guinea, Its Situation, Produce, and the General Disposition of Its Inhabitants An Inquiry into the Rise and Progress of the Slave Trade, Its Nature and Lamentable Effects

An Inquiry into the Nature and Causes of the Wealth of Nations