Joseph Proust's law of definite composition says that pure chemicals are composed of elements in a definite formulation; we now know that the structural arrangement of these elements is also important.
Joseph Proust's law of definite proportions and John Dalton's atomic theory branched from the discoveries of Antoine Lavoisier.
Equivalent weights were a useful generalisation of Joseph Proust's law of definite proportions (1794) that enabled chemistry to become a quantitative science.
He started a public course in his laboratory in 1738 where he taught many students among whom were Denis Diderot, Antoine-Laurent de Lavoisier, Joseph Proust and Antoine-Augustin Parmentier.
Joseph Stalin | Joseph Conrad | Saint Joseph | Joseph Haydn | Joseph Beuys | Joseph | Joseph Goebbels | Marcel Proust | Joseph II, Holy Roman Emperor | Joseph Barbera | Joseph Chamberlain | Joseph Brodsky | Franz Joseph I of Austria | Joseph Henry Blackburne | Joseph Banks | Joseph McCarthy | Joseph II | Joseph Campbell | Joseph and the Amazing Technicolor Dreamcoat | Joseph Priestley | Joseph Bonaparte | Joseph Pulitzer | Joseph Stiglitz | Joseph Paxton | Joseph Addison | Joseph Rothrock | Joseph Losey | Joseph Lister, 1st Baron Lister | Joseph Story | Joseph Whitworth |