. . "A letter to Augustus De Morgan, Esq. ... on his claim to an independent re-discovery of a new principle in the theory of syllogism from Sir William Hamilton, Bart. : subjoined, the whole previous correspondence, and a postscript in answer to Professor De Morgan's \"Statement.\""@en . . . . . . . . . . . "A letter to Augustus De Morgan, Esq. ... on his claim to an independent re-discovery of a new principle in the theory of syllogism"@en . . .