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IT has been shown by one of us that benzene, naphthalene, ant hracene, and phenanthrene all yield spectra with characteristic absorption bands, that this property is shared by the various homologues of benzene, their hydroxyl, carboxyl, amido-, and other such derivatives, and by the tertiary bases pyridine, picoline, and quinoline.
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Hartley et al. (1898) studied this question.
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