[87]

Sir S. Wilks, Medical Magazine, January, 1894; cf. Clifford Allbutt, "Music, Rhythm, and Muscle," Nature, February 8, 1894.

[88]

Bücher, Arbeit und Rhythmus, third edition, 1902; Wundt, Völkerpsychologie, 1900, Part I, p. 265.

[89]

Féré deals fully with the question in his book, Travail et Plaisir, 1904, Chapter III, "Influence du Rhythme sur le Travail."

[90]