Julius Lothar Meyer

Julius Lothar Meyer (19 August 1830 – 11 April 1895) was a German chemist. He was one of the pioneers in developing the earliest versions of the periodic table of the chemical elements. The Russian chemist Dmitri Mendeleev (his chief rival) and he had both worked with Robert Bunsen. Meyer never used his first given name and was known throughout his life simply as Lothar Meyer. Meyer was born in Varel, Germany (then part of the Duchy of Oldenburg). He was the son of Friedrich August Meyer, a physician, and Anna Biermann. After attending the Altes Gymnasium in Oldenburg, he studied medicine at the University of Zurich in 1851. Two years later, he studied pathology at the University of Würzburg as a student of Rudolf Virchow. At Zurich, he had studied under Carl Ludwig, which had prompted him to devote his attention to physiological chemistry. After graduating as a Doctor of Medicine from Würzburg in 1854, he went to Heidelberg University, where Robert Bunsen held the chair of chemistry. In 1858, he received a Ph.D. in chemistry from the University of Breslau with a thesis on the effects of carbon monoxide on the blood. With this interest in the physiology of respiration, he had recognized that oxygen combines with the hemoglobin in blood. Influenced by the mathematical teaching of Gustav Kirchhoff, he took up the study of mathematical physics at the University of Königsberg under Franz Ernst Neumann and in 1859, after having received his habilitation (certification for university teaching), became Privatdozent in physics and chemistry at the University of Breslau. In 1866, Meyer accepted a post at the Eberswalde Forestry Academy at Neustadt-Eberswalde but two years later was appointed to a professorship at the Karlsruhe Polytechnic. In 1872, Meyer was the first to suggest that the six carbon atoms in the benzene ring (that had been proposed a few years earlier by August Kekulé) were interconnected by single bonds only, the fourth valence of each carbon atom being directed toward the interior of the ring.