SCIENCE AND MEDICINE - LE VERRIER Joseph (1811 - 1877) - Autograph letter signed

Mathematician who in 1838 studied the causes of disturbances in the solar system. He predicted the existence of Neptune. He was a professor at the Sorbonne. He took part in the revolutions of 1848. In 1854, he became director of the Paris Observatory.
Autograph letter signed Paris, 1860 ca. :"... je ne pourrai avoir l'avantage d'envoyer un exemplaire…”. 1 p in-8.