[269] Küster, _Zeitschr. physikal. Chem._, 1895, 17. 360. [270] Küster, _ibid._, 1891, 8. 589. [271] It should be remarked that the behaviour described here will hold strictly only when the solid mixed crystals undergo change sufficiently rapidly to be always in equilibrium with the liquid. This, however, is not always the case (see Reinders, _Zeitschr. physikal. Chem._, 1900, 32. 494; van Wyk, _Zeitschr. anorg. Chem._, 1905, 48. 25), and complete solidification will not in this case take place at the temperature corresponding with the line _dc_ in Fig. 50, but only at a lower temperature. [272] Adriani, _Zeitschr. physikal. Chem._, 1900, 33. 469. [273] Reinders, _Zeitschr. physikal. Chem._, 1900, 32. 494. [274] Hissink, _Zeitschr. physikal. Chem._, 1900, 32. 542. [275] Van Eyk, _Zeitschr. physikal. Chem._, 1899, 30. 430. [276] Cady, _Journ. Physical. Chem._, 1899, 3. 127. [277] See Roberts-Austen and Stansfield, _Rapports du congrès international de physique_, 1900, I. 363. [278] Heycock and Neville, _Proc. Roy. Soc._, 1903, 71. 409. For the partial liquefaction of mixed crystals on cooling, see also A. C. de Kock (_Zeitschr. physikal. Chem._, 1904, 48. 129). [279] Armstrong, _Watt's Dictionary of Chemistry_ (Morley and Muir), III., p. 88. See also Lowry, _Jour. Chem. Soc._, 1899, 75. 211. [280] See Bancroft, _Journ. Physical Chem._, 1898, 2. 143; Roozeboom, _Zeitschr. physikal. Chem._, 1899, 28. 288. [281] Hylotropic substances are such as can undergo transformation into other substances of the same composition (Ostwald, _Lehrbuch_, II. 2. 298). [282] Also called Equilibrium Point (Lowry). [283] For a discussion of these systems, see Roozeboom, _Zeitschr. physikal. Chem._, _loc. cit_. [284] See Bancroft, _loc. cit._, p. 147; Wegscheider, _Sitzungsber. Wiener Akad._, 1902, 110. 908.