Chapter XXV: 395 (3)

[426] Professor Henle derives the negative wag of the head from an incipient shudder, and remarks how fortunate is the abbreviation, as when a lady declines a partner in the ball-room. The clapping of the hands for applause he explains as a symbolic abridgment of an embrace. The protrusion of the lips (_der prufende Zug_) which goes with all sorts of dubious and questioning states of mind is derived by Dr. Piderit from the _tasting_ movement which we can see on any one's mouth when deciding whether a wine is good or not.

[427] _Loc. cit._ § 497. Why a dog's face-muscles are not more mobile than they are Mr. Spencer fails to explain, as also why different stimuli should innervate these small muscles in such different ways, if easy drainage be the only principle involved. Charles Bell accounted for the special part played by the facial muscles in expression by their being _accessory muscles of respiration_, governed by nerves whose origin is close to the respiratory centre in the medulla oblongata. They are an adjuvant of _voice_, and like it their function is _communication_. (See Bell's Anatomy of Expression. Appendix by Alexander Shaw.)

[428] La Paura, Appendice, p. 295.

[429] See below, p. 627.