26 



STUDY OF ABSORPTION SPECTRA 



vent in the neighborhood of 1.2/z (fig. 9) where the absorption is intense, 

 as it is approaching the center of the 1.25/z water-band. Here the solu- 

 tion is the more transparent, as is generally the case with hydrated salts. 

 The curves for calcium chloride (figs. 11 and 12) deserve careful 

 study. The solution is more transparent than the solvent for every 

 wave-length of light that we studied. This holds true for both of the 



TABLE 10. Depth of cell SO mm. Transmissions of zinc nitrate, 

 calcium chloride, and water. 



