The Absorption Coefficient of Solution for Monochromatic Radiation. 31 



COBALT CHLORIDE IN PROPYL ALCOHOL. 



Eight solutions were prepared varying in concentration from c = 0.434 

 to c = 0.10. The character of the absorption curves is the same as that 

 of the ethyl-alcohol solutions, the minimum of absorption occurring 

 again at 842^ and the steepness of the edges of the bands being 

 similar. The propyl-alcohol solutions were also deep blue, becoming 

 a greenish blue upon dilution. The absorption curve for c = 0.434 has 

 been drawn in greater detail, readings having been taken at every 10^. 



The Ac curve for 744ju/i, lying on the edge of the yellow-red 

 absorption band, shows that A decreases greatly with dilution. This 



800 900 1,000 1,100 1,200 I.300//./6 



FIG. 8. The A-c and Absorption Curves for Cobalt Chloride in Propyl Alcohol. 



