[204] Provided the solid nitrile is not present in too great excess.
[205] Wied. Annalen, 1886, 28. 328. Cf. Ostwald, Lehrbuch, II. 2. 872.
[206] Walker, Zeitschr. physikal. Chem., 1890, 5. 193. Schreinemakers, ibid., 1897, 23. 417. Roozeboom, Rec. trav. chim. Pays-Bays, 1889, 8. 257. Bruner, Zeitschr. physikal. Chem., 1897, 23. 542.
[207] Van't Hoff, Lectures on Theoretical Chemistry, I. p. 42. Ostwald, Lehrbuch, II. 2. 824.
[208] Ostwald, Principles of Inorganic Chemistry, translated by A. Findlay, 2nd edit., p. 453 (Macmillan, 1904); Skirrow and Calvert, Zeitschr. physikal. Chem., 1901, 37. 217.
[209] Vide Loewel, Annales chim. phys., 1857 [3], 49. 32. Cf. Löwenherz, Zeitschr. physikal. Chem., 1895, 18. 82.
[210] Loewel, loc. cit. Gay-Lussac, Annales chim. phys., 1819, 11. 296. For the solubility at higher temperatures, see Tilden and Shenstone, Phil. Trans., 1884, 175. 23. Étard, Annales chim. phys., 1894 [7], 2. 548.
[211] Richards, Zeitschr. physikal. Chem., 1898, 26. 690; Richards and Wells, ibid., 1903, 43. 465. This temperature is not quite the same as that of the quadruple point anhydrous salt—hydrated salt—solution—vapour, because the latter is the temperature at which the system is under the pressure of its own vapour. Since, however, the influence of pressure on the solubility is very slight (p. [107]), the position of the two points will not be greatly different. The quadruple point was found by Cohen (Zeitschr. physikal. Chem., 1894, 14. 90) to be 32.6° and 30.8 mm. of mercury.
[212] Van't Hoff and van Deventer, Zeitschr. physikal. Chem., 1887, 1. 185. Cf. Cohen, ibid., 1894, 14. 88.
[213] Debray, Compt. rend., 1868, 66. 194.