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Rh appear to have cast a shadow upon their friendship, and the large accumulation of letters in Wöhler's hands testifies to the tribute of respect and affection which Liebig showed toward one who could have been a most dangerous rival.

Wöhler's career took an unexpected turn during the winter of 1824-'25. The Gewerbeschule was at that time founded in Berlin. It consisted of but one class in the beginning, to which Henry Rose gave instruction in chemistry. Rose, Mitscherlich, and especially Leopold von Buch, recommended Wöhler for the chair of chemistry in the newly founded institution. To the two former he had been introduced by Berzelius, while Leopold von Buch had previously made his acquaintance while he was a student at the University of Marburg. The young student had made such an impression on Von Buch that he became his devoted friend and patron. Wöhler had found a new variety of harmotome (Phillipsite) in a basalt-quarry near Marburg, and, as Von Buch had in the last century published a notice of this mineral, the new variety greatly interested him, and he was also pleased to find a young man so well versed in mineralogy. When the question of the new position in Berlin was pending, Von Buch wrote a long and characteristic letter to Wöhler in which, with sprightly humor, he described the society and the chief personages of Berlin of that day, and endeavored to persuade the young chemist to select the Prussian capital, in preference to Heidelberg, as a place of residence. Wöhler did not long hesitate, and in March, 1825, removed to Berlin, where he was at once installed, under Director Kloeden, as teacher of chemistry and mineralogy. At first he only took the position on trial for a year, on a salary of three hundred dollars and a modest apartment. By degrees the institution grew in importance, and Wöhler's salary was very much increased, and a fine dwelling was assigned to him; and in 1828, by royal decree, he was raised to the rank of professor. It was at about this time that he was married to his first wife who was the daughter of a wealthy banker of Cassel. The young professor now entered upon a prosperous career. His residence at the capital of Prussia, the great resources which were at his command, the constant scientific intercourse with the favorite pupils of Berzelius, Mitscherlich, Henry Rose, Gustavus Rose, and particularly with his intimate friend Magnus, and the opportunity of meeting with other shining lights of the day, could not fail to exert an inspiring and instructive influence.

Wöhler always considered it peculiarly fortunate that he was here able to make the personal acquaintance of Alexander von Humboldt, and to have the privilege of listening to his intellectual conversations, and of attending his celebrated lectures on Cosmos. In the year 1828 Von Humboldt was made President of the German Association of Naturalists, and opened the session with a most finished and brilliant discourse, and, though crowded with work, he still found time during the meeting