[401] _Zeitschr. physikal. Chem._, 1895, 17. 153. [402] _Zeitschr. physikal. Chem._, 1899, 28. 464. [403] Meyerhoffer and Saunders, _ibid._, p. 466. [404] See Van Eyk, _Zeitschr. physikal. Chem._, 1899, 30. 446. [405] See in this connection the volume in this series on _Electro-chemistry_, by Dr. R. A. Lehfeldt. [406] Barnes and Cooke, _Journ. Physical Chem._, 1902, 6. 172. [407] For a description and explanation of these, the reader should consult the volume in this series by Dr. Lehfeldt on _Electro-chemistry_; and van't Hoff, _Bildung und Spaltung von Doppelsalzen_, p. 48 _ff._ * * * * * Changes made to the printed original. Pages 30-31. "Fig. 3, p. 27.": 'p. 25." in original. So also page 33, "Fig. 2, p. 27". Page 57. "pp. 29 and 35": 'pp. 25 and 38" in original. Page 65. "p. 57.": 'p. 60" in original (twice). Page 166. "there is the point C_{1}": C' in original. Page 225. "C is an eutectic point": 'eutetic' in original. Page 228. "Although this view put forward by Heyn": 'Athough' in original. Page 232. "the period of constant temperature for the eutectic point c": 'the eutectic point e' in original. Page 249. "two liquid layers between 13° and 31°": 'betwen' in original. Page 257. Tables entries 4 and 7. "naphthol": 'napthol' in original. Page 287. "from which the model is constructed": 'he model' in original.