[253] Roozeboom, Zeitschr. physikal. Chem., loc. cit.
[254] Van't Hoff, Zeitschr. physikal. Chem., 1890, 5. 323.
[255] Bancroft has proposed to restrict the term "occlusion" to the formation of solid solutions, and to apply "adsorption" only to effects which are primarily due to surface tension. Such a distinction, however, would probably be very difficult to carry through, for although adsorption may, in large measure, be due to surface tension, the behaviour of adsorbed substances is similar to that of substances existing in solid solutions.
[256] Tammann, Wied. Annalen, 1897, 63. 16; Zeitschr. physikal. Chem., 1898, 27. 323.
[257] See, for example, Chappuis, Wied. Annalen, 1881, 12. 161; Joulin, Annal. chim. phys., 1881, [5], 22. 398; Kayser, Wied. Annalen, 1881, 12. 526.
[258] Hoitsema, Zeitschr. physikal. Chem., 1895, 17. 1.
[259] Annales chim. phys., 1874, [5], 2. 279.
[260] Hoitsema, Zeitschr. physikal. Chem., 1895, 17. 1; Dewar, Phil. Mag., 1874, [4], 47, 324, 342; Mond, Ramsay and Shields, Proc. Royal Soc., 1897, 62. 290.
[261] Loc. cit.
[262] It is noteworthy that the form of curve obtained for hydrogen and palladium bears a striking resemblance to that for the dehydration of colloids containing absorbed water, e.g. silicic acid (vide van Bemmelen, Zeitschr. anorg. Chem., 1897-1900. Cf. Zacharias, Zeitschr. physikal. Chem., 1902, 39. 480).