ON ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION. 



103 



dilution. The absorption spectra of phloroglucinol in aqueous and alcoholic 

 solutions are identical. 



Phloroglucinol trimethyl ether. — This compound "was prepared by 

 saturating a solution of pure phloroglucinol in methyl alcohol with hydro 

 chloric acid gas, and subsequently treating the dimethyl ether so obtained 



Curves of Molecular Vibratmu. — (3) Pyrogallol ; (4) Phenol. 



with methyl iodide and potassium hydroxide dissolved in methyl alcohol.^ 

 The product is an oil which quickly solidifies to beautiful colourless 

 prisms, M.P. 52-5°. 



The spectra of this substance in alcoholic solution were photographed, 

 and the compound itself was afterwards recovered from the alcoholic 

 solution and found to be unaltered. The spectra are practically identical 

 with those of phloroglucinol, as will be seen from a comparison of the 

 measurements and curves. 



' Will, £er., 21, 603. 



