[39] See W. O. Atwater and H. C. Sherman: The effect of severe and prolonged muscular work on food consumption, digestion, and metabolism. Bulletin No. 98, Office of Experiment Stations, U. S. Department of Agriculture.
[40] Atwater and Sherman. Loc. cit., p. 51.
[41] L. Schnyder: Muskelkraft und Gaswechsel. Zeitschrift für Biologie, Band 33, p. 289.
[42] G. Katzenstein: Ueber die Einwirkung der Muskelthätigkeit auf den Stoffverbrauch des Menschen. Pflüger’s Archiv für die gesammte Physiologie, Band 49, p. 330. Also Magnus-Levy: v. Noorden’s Handbuch der Pathologie der Stoffwechsel, p. 233.
[43] See Gesammelte Schriften von Adolf Fick. Ueber die Entstehung der Muskelkraft. Band 2, p. 85. Würzburg, 1903.
[44] Pflüger: Die Quelle der Muskelkraft. Pflüger’s Archiv für die gesammte Physiologie, Band 50, p. 98.
[45] Argutinsky: Muskelarbeit und Stickstoffumsatz. Ibid., Band 46, p. 552.
[46] Bunge: Textbook of Physiological and Pathological Chemistry. Second English Edition, 1902, p. 352.
[47] Quoted from Leathes: Problems in Animal Metabolism, p. 100.
[48] This and the following account of Weston are taken from Bulletin No. 98, U. S. Department of Agriculture, Office of Experiment Stations. The effect of severe and prolonged muscular work on food consumption, digestion, and metabolism. By W. O. Atwater and H. C. Sherman, p. 13.