References
W. James, Principles of Psychology, ii., 1890, ch. xxvi.; W. Wundt, Lectures on Human and Animal Psychology, 1896, Lects. xviii., xxix.; Outlines of Psychology, 1907, § 14; E. B. Titchener, Text-book of Psychology, 1910, 428 ff.
Special references are: T. H. Huxley, Lessons in Elementary Physiology, Lesson xi. (1896, 302); C. L. Morgan, Animal Behaviour, 1900, 138; A. Bain, The Emotions and the Will: The Will, ch. iii. (1880, 352 and elsewhere); H. Spencer, The Principles of Ethics, i., ch. xiv. (1892, 244 and elsewhere); L. Stephen, The Science of Ethics, 1882, 50; J. Sully, The Human Mind, ii., 1892, 2, 236. The technique of the vernier chronoscope is described by Titchener, Experimental Psychology, I., i., 1901, 117 ff.; ii., 212 ff.