[280] Proc. Chem. Soc. 1898, 14, 70.
[281] Compt. rend. 1898, 126, 900.
[282] Amer. Chem. J. 1898, 20, 345.
[283] Proc. Chem. Soc. 1901, 17, 66.
In his second determination in 1908, Auer von Welsbach[284] gave the value 144·54 as the mean of three determinations. Feit and Przibylla,[285] using their volumetric method, gave the value 144·52, whilst Holmberg,[286] using material which he considered to have been the purest obtained up to that time, obtained the figure 144·11. More recently, Baxter and Chapin[287] have made determinations by treating the chloride with pure silver nitrate, and weighing the precipitated silver chloride, as well as by titration. The mean value obtained by the first method—ratio NdCl₃ : 3AgCl—was 144·272 (extremes 144·250 and 144·298), and by the second method—ratio NdCl₃ : 3Ag—was 144·268 (extremes 144·249 and 144·283), giving the mean value for the whole series of 144·270.
[284] Loc. cit.
[285] Zeitsch. anorg. Chem. 1905, 43, 202; ibid. 1906, 50, 249.
[286] Ibid. 1907, 53, 124.
[287] Proc. Amer. Acad. 1911, 46, 215.
The value adopted by the International Committee is 144·3.