Note 72 — Chapter VII · THE NATURE OF EMOTION.
Reading edition
Wundt, Physiologische Psychologie, 4th (German) ed., chap. xx.; Külpe, Grundriss der Psychologie, p. 250 (English edition), § 38; Sully, Sensation and Intuition, Part II.; Grant Allen, Mind, July 1879 (“The Origin of the Sense of Symmetry”).