Chapter 16

[1] Locke: _The Conduct of the Understanding_, Bohn's Library Edition, Vol. I, p. 72; also, _passim_.

[2] Locke: _Op. cit._, p. 56.

[3] Descartes: _Discourse on Method_, translated by Veitch, pp. 13-14. Also, _passim_.

[4] Spinoza: _The Improvement of the Understanding_, translated by Elwes, Vol. II, p. 4.

[5] _Cf._ Plato's _Republic_, Books V-VII, _passim_.

[6] For further discussion of the meaning of duty, _cf._ Kant's _Critical Examination of the Practical Reason_, Book I, Chapter III, translated in Abbott's _Kant's Theory of Ethics_, p. 164; Bradley's _Ethical Studies_, Essays II and V; and Sidgwick's _Methods of Ethics_,