of cubic reciprocity and quartic reciprocity. In June 1844 Eisenstein visited Carl Friedrich Gauss in Göttingen. In 1845, Kummer saw to it that he received an honorary doctorate at the University of Breslau. Jacobi also encouraged the distinction, but later relations between Jacobi and Eisenstein were always rocky, due primarily to a disagreement over the order of discoveries made in 1846. In 1847 Eisenstein habilitated at the University of Berlin, and he began to teach there. Bernhard Riemann attended his classes on elliptic functions. Imprisonment and death In 1848 Eisenstein was imprisoned briefly by the Prussian army for his revolutionary activities in Berlin. Eisenstein always had republican sympathies, and while he did not actively participate in the revolution of 1848, he was arrested on 19 March of that year. Although he was released just one day later, the harsh treatment he suffered damaged his already delicate health. But his association with the Republican cause led to his official stipends being revoked, despite Humboldt tenaciously coming to his defense. Despite his health, Eisenstein continued writing papers on quadratic partitions of prime numbers and the reciprocity laws. In 1851, at the instigation of Gauss, he was elected to the Academy of Göttingen; one year later, this time at the recommendation of Dirichlet, he was also elected to the Academy of Berlin. He died of tuberculosis at the age of 29. Humboldt, then 83, accompanied his remains to the cemetery. He had recently obtained, too late, as it turned out, the funding necessary to send Eisenstein on holiday to Sicily. Purported Gauss quote E. T. Bell in his 1937 book Men of Mathematics (page 237) claims that Gauss said "There have been but three epoch-making mathematicians, Archimedes, Newton, and Eisenstein", and this has been widely quoted in writings about Eisenstein. This is not a quote by Gauss, but is (a translation of) the end of a sentence from the biography of Eisenstein by , one of Gauss's last students and a historian of mathematics, who was summarizing his recollection of a remark made by Gauss about Eisenstein in a conversation many years earlier. Although it is doubtful that Gauss really put Eisenstein in the same league as Newton, his writings show that Gauss thought very highly of Eisenstein. For example, a letter from Gauss to Humboldt, dated the 14th of April in 1846, says that Eisenstein's talent is one that nature bestows only