[68] Theodor Rosenheim: Ueber den Gesundheitsschädigenden Einfluss eiweissarmer Nahrung. DuBois-Reymond’s Archiv für Physiologie, 1891, p. 341. Also, Weiterer Untersuchungen über die Schädlichkeit eiweissarmer Nahrung. Pflüger’s Archiv f. d. gesammte Physiologie, Band 54, p. 61, 1893.
[69] B. H. Jägerroos: Ueber die Folgen einer ausreichenden, aber eiweissarmen Nahrung. Skandinavisches Archiv für Physiologie, Band 13, p. 375, 1902.
[70] Chalmers Watson, M.D., and Andrew Hunter, M.B.: Observations on Diet. The Influence of Diet on Growth and Nutrition. Journal of Physiology, Vol. XXXIV, p. 112, 1906.
[71] The fuel value of the food was calculated from the data given in Bulletin No. 28, U. S. Department of Agriculture. All figures for nitrogen were obtained by exact chemical analysis.
[72] All through the balance periods the dogs were catheterized each morning to insure complete collection of the twenty-four hours’ urine.
[73] See Osborne and Clapp: The Chemistry of the Protein Bodies of the Wheat Kernel. American Journal of Physiology, vol. 17, p. 231.
[74] There is an unavoidable error here, since the excrement contains not only undigested food, but also contains some nitrogenous matter derived from the secretions of the intestine, etc.
[75] Edward Curtis, M.D.: Nature and Health, p. 70. Henry Holt & Company, New York, 1906.
[76] Aran Coirce: British Medical Journal, April 7, 1906, p. 829.
[77] Irving Fisher: A new method for indicating food values. American Journal of Physiology, vol. 15, p. 417, 1906.