Jules Henri DebrayJules Henri Debray (26 July 1827, in Amiens – 19 July 1888, in Paris) was a French chemist. In 1847 he began his studies at the École Normale Supérieure in Paris, and several years later became an instructor at the Lycée Charlemagne (1855). From 1875 onward, he taught classes in chemistry at the École Normale Supérieure, where in 1881 he succeeded Henri Étienne Sainte-Claire Deville as professor of chemistry. He is best remembered for his collaborative research with Sainte-Claire Deville involving the properties of platinum metals, in particular, the melting of platinum and its alloys.
Amedeo AvogadroLorenzo Romano Amedeo Carlo Avogadro, Count of Quaregna and Cerreto (ˌævəˈɡɑːdroʊ, also USˌɑːv-, ameˈdɛːo avoˈɡaːdro; 9 August 1776 - 9 July 1856) was an Italian scientist, most noted for his contribution to molecular theory now known as Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. In tribute to him, the ratio of the number of elementary entities (atoms, molecules, ions or other particles) in a substance to its amount of substance (the latter having the unit mole), , is known as the Avogadro constant.
SagesseSagesse (literal trans. "Wisdom") is a volume of French poetry by Paul Verlaine. First published in 1881 (see 1880), it was important in the symbolist and modernist movements. The subject matter of these poems deals with themes relating to maturing. The poems contained in this volume include: Beauté des femmes. Bon chevalier masqué. C'est la fête du blé, c'est la fête du pain. Désormais le Sage, puni. Du fond du grabat. Écoutez la chanson bien douce. Et j'ai revu l'enfant unique : il m'a semblé.
