Christoph J. Scriba

John Wallis' Treatise of Angular Sections and Thabit ibn Qurra's Generalization of the Pythagorean Theorem

:schaften der Universitat Hamburg. The author :acknowledges with thanks financial assistance of the Deutsche Forschungsgemeinschaft. 1Aydin Sayili, ThAbit ibn Qurras Generalization of the Pythagorean Theorem, Isis, 1960, 51:35-37. 2 If the angle BAC is obtuse, the positions of B and C will be interchanged. 3 He quoted Walther Lietzmann, Der pythagoreische Lehrsatz (Leipzig/Berlin: Teubner, 1937), pp. 38-40, and (Stuttgart: Teubner, 1953) pp. 46-47, and he added: The earlier edition of 1930 of his book did not contain this theorem. It is curious that Lietzmann

Éloge: Walter Baron, 1904-1971

On April 6, 1971, Professor Walter Baron died at the age of sixty-seven at his home in Hamburg. Only some days before he had paid a visit to friends in Switzerland, and his death occurred without any warning to him. Early in March the Institut fur Geschichte der Naturwissenschaften of the University of Hamburg had lost its Professor Emeritus, Adolf Meyer-Abich. With Walter Baron, its second member