[48] Lehmann, Molekularphysik, I. 153.; Arzruni, Physikalische Chemie der Krystalle. (Graham-Otto, Lehrbuch der Chemie, I. 3.)
[49] Brodie, Proc. Roy. Soc., 1855, 7. 24.
[50] That solid sulphur does possess a certain vapour pressure has been shown by Hallock, who observed the formation at the ordinary temperature of copper sulphide in a tube containing copper and sulphur (Amer. Jour. Sci., 1889 [3], 37. 405). See also Zenghelis, Zeitschr. physikal. Chem., 1904, 50. 219.
[51] Zeitschr. für Krystallographie, 1884, 8. 593.
[52] Van't Hoff, Studies on Chemical Dynamics, p. 163.
[53] Reicher, loc. cit. See also Tammann, Annalen der Physik, 1899 [3], 68. 663.
[54] Tammann, Annalen der Physik, 1899 [3], 68. 633.
[55] Rec. Trav. Chim. Pays-Bas, 1887, 6. 314.
[56] Cf. van't Hoff, Lectures on Physical Chemistry, I., p. 27 (Arnold).
[57] Annalen der Physik, 1899 [3], 68. 663.