ABSORPTION SPECTRA. 375 
Logarithms a relative thickness in millimeters of 1/10,000 molar solution. 
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Relative thickness of layer in millimeters of 1/10,000 molar solution. 
Fic. 2.—P-nitrosophenol=full curve. P-nitrosophenol saturated with HCl=dot curve. P-nitro- 
sophenol with 1/10 equivalent of sodium ethoxide=dot and dash curve. P-nitro- 
sophenol with 1 equivalent of sodium ethoxide=dash curve. 
