David Hartley (philosopher) - Observations On Man

Observations On Man

His principal work Observations on Man, his Frame, his Duty, and his Expectations was published in 1749, three years after Condillac's Essai sur l'origine des connaissances humaines, in which similar theories were expounded. It is in two parts—the first dealing with the frame of the human body and mind, and their mutual connections and influences, the second with the duty and expectations of mankind. His two main theories are the doctrine of vibrations and the doctrine of associations. His physical theory, he tells us, was drawn from certain speculations as to nervous action which Isaac Newton had published in his Principia. His psychological theory was suggested by the Dissertation concerning the Fundamental Principles of Virtue or Morality, which was written by a clergyman named John Gay (1699—1745), and prefixed by Bishop Law to his translation of Archbishop King's Latin work on the Origin of Evil, its chief object being to show that sympathy and conscience are developments by means of association from the selfish feelings.