"Meyer published along with [Paul] Jacobson a "Text book of Organic Chemistry" [Lehrbuch der Organischen Chemie], which was not finished; also, either alone or in conjunction with his pupils, upwards of 300 memoirs and papers... His researches [included]...Di- and tri-bromobenzene, in work on which he gained further evidence in support of his view that in the case of the chlorine, bromine, iodine, and nitroxyl (NO2) derivatives of aromatic amines, obtained by the direct substitution of an element, it is always the hydrogen contiguous to the NH2 group that is replaced."
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James Campbell Brown, A History of Chemistry from the Earliest Times (1920) p.391
https://en.wikiquote.org/wiki/Iodine
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