Editorial note — Page 67 CHAPTER IV
Reading edition
[Footnote 2: Frederick S. Lee: "Physical Exercise from the Standpoint of Physiology," Science, N.S., vol. XXIX, no. 744, p. 525.]
[Footnote 3: Lee: Fatigue. Harvey Lectures, 1905-06, p. 180.]
[Footnote 4: For a summary of nervous fatigue and extensive bibliography, see Goldmark: loc. cit., p. 32.]