282 JONES AND ANDERSON— ABSORPTION SPECTRA OF [April 25, 



to A 5150, and from A 5180 to A 5270. There is again incomplete 

 absorption from A 5270 to A 5330, with indication of a band at 



A 5315- 



The Hmits of the yellow band in b, plate i, are A 5700-A 5880, 

 in the strip corresponding to the most concentrated solution. The 

 band narrows by 30 Angstrom units on this spectrogram, the nar- 

 rowing being due to a decrease in the shading towards the red, with 

 decrease in concentration. 



The most intense bands of neodymium chloride, and hence the 

 ones which would be most conspicuous in a very dilute solution are 

 the following : A 3465, A 3540, A 4275, A 5205, A 5225, A 5745, A 5765 

 and A 7325. 



The wave-lengths of all the bands are collected in the following 

 table, together with a brief description of the appearance of each 

 band. It is to be understood that this table is not meant to repre- 

 sent W'hat could be seen or photographed in any one solution of 

 neodymium chloride in water. It merely records the positions of 

 all the bands that can be seen in a layer from 3 to 12 mm. deep, 

 wdien the concentration is varied from o to 3.4 normal. 



A Description. 



2900 About 20 A. U. wide. 



2985 About 25 A. U. wide. 



3225 Narrow and sharp. 



3390 Narrow, faint. 



3465 Very intense, narrow. 



3505 Rather wide. 



3540 Very intense, narrow. 



3560 Faint, narrow. 



4180 Faint, hazy. 



4275 Very intense and sharp. 



4290 Very narrow, faint. 



4330 Hazy edges. 



4615 Rather wide and hazy. 



4645 Very narrow, faint. 



4695 Narrow, intense. 



4760 Hazy edges, fairly narrow. 



4825 Narrow and fairly intense. 



5090 Narrow, intense. 



5125 Rather wide and hazy. 



5205 Very intense, narrow. 



5222 Very intense, narrow. 



