ABSORPTION SPECTRA. 377 
Logarithms of 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. 3.—O-nitrophenol; O-nitrophenol with trace HCl=upper full curves. O-nitrophenol with 
1/10 equivalent of sodium ethoxide=dot curve. O-nitrophenol with 3 equivalent of 
sodium ethoxide=dash curve. O-nitrophenol with 1 equivalent of sodium ethoxide= 
lower full curve. 
ence of which is slightly reduced. ‘The change in this compound 
is represented by the chemical equilibrium: 
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and from its behavior we are led to believe that there exists 
in it a greater inherent tendency for the transformation into 
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