[41] Loc. cit. Dr. L. Hill confirms the observation and offers the same explanation.
[42] In this connection an observation sent me by Dr. L. Hill is significant. His little girl first responded with laughter to tickling under the armpits at the same age (two and a half years) as she first showed fear by crying on being put into the arms of a stranger.
[43] G. Heymans, Zeitschrift für die Psychol. und die Physiol. der Sinne, Bd. xi., ss. 31 ff.
[44] Heymans, loc. cit.
[45] The abnormal forms of automatic laughter, including the effects of stimulants, are dealt with by Raulin, op. cit., 2ème partie, chap. iv., and 3ème partie.
[46] Given in the returns to Stanley Hall’s inquiries. This explosion of laughter on receiving sad news occurs in cases of cerebral disorder. See Dugas, op. cit., p. 16.
[47] Quoted by Dugas, op. cit., p. 12.
[48] Shakespeare makes Lady Macbeth perpetrate a pun in a moment of intense excitement when Macbeth’s hesitation goads her into a resolve to carry out the murder herself:—
“I’ll gild the faces of the grooms withal
For it must seem their guilt”.