NEODYMIUM SALTS. 



71 



The following table gives the wave-lengths of the neodymium bands 

 in aqueous solution as measured by various spectroscopists: 



i Com pt. rend., 126, 1039 (1898). 



Ber. d. deutsch. chem Gesell., 32 (1899). 



*Ibid., 35.486(1909). 



<Ztschr. anorg. Chem., 118 (1907). 



6 Die qualitat. Spectralanal. anorg. Korper, Berlin (1900). 



Wiener Sitzungsberichte, 1 18, a 1252-1266 (1899). 



Stahl states that the bands X 6950, X 6840, and X 6780 vary enormously in 

 their relative intensities in the various solutions. In the presence of strong 

 nitric acid the bands X 4710, X 4690, and X 4570 disappear completely. The 

 absorption spectrum of the chloride is independent of the presence of free acid. 



Neodymium: X 6710, X 6240, ,15790, X 5720, X 4340, X 4190, X 3800, 

 X 3390, X 3270. 



Praseodymium : X 5970, X 5890, X 4820, X 4690, X 4440. 



