Henry Longueville Mansel

In 1867 he succeeded Arthur Penrhyn Stanley as regius professor of ecclesiastical history, and in 1868 he was appointed dean of St Paul's.

Like Hamilton, Mansel maintained the purely formal character of logic, the duality of consciousness as testifying to both self and the external world, and the limitation of knowledge to the finite and "conditioned."

1888) he applied to Christian theology the metaphysical agnosticism which seemed to result from Kant's criticism, and which had been developed in Hamilton's Philosophy of the Unconditioned.

While denying all knowledge of the supersensuous, Mansel deviated from Kant in contending that cognition of the ego as it really belongs among the facts of experience.

Consciousness, he held – agreeing thus with the doctrine of "natural realism" which Hamilton developed from Reid – implies knowledge both of self and of the external world.