[18] The term "degree of freedom" employed here must not be confused with the same term used to denote the various movements of a gas molecule according to the kinetic theory.
[19] Trevor, Jour. Physical Chem., 1902, 6. 136.
[20] Ostwald, Principles of Inorganic Chemistry, translated by A. Findlay, 2nd edit., p. 7. (Macmillan, 1904.)
[21] See the volume in this series on Thermodynamics by F. G. Donnan.
[22] Pogg. Annalen, 1844, 61. 225.
[23] Mémoires de l'Acad., 26. 751.
[24] Phil. Trans. 1884, 175. 461; 1892, A, 183. 107.
[25] Bihang Svenska Akad. Handl. 1891, 17. I. 1.
[26] Abhandl. physikal.-tech. Reichsanstalt, 1900, 3. 71.
[27] Ostwald-Luther, Physiko-chemische Messungen, 2nd edit., p. 156.