Hellenica World

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Discovery of Praseodymium "Didymium" (Mosander) / 1885 Auer,

23 January 1840 Birth of Ernst Karl Abbe in Eisenach

1 July 1840 Birth of Robert Stawell Ball, in Dublin, Ireland

4 October 1840 Birth of Viktor Carl Knorre in Nikolajew, Ukraine

1840 Birth of Sophia Jex-Blake

1840 Birth of Lars Fredrik Nilson

Chronology

1839 - 1840 - 1841

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