Dmitri Mendeleev
Unaware of the earlier work on periodic tables going on in the 1860s, he made the following table:
By adding additional elements following this pattern, Mendeleev developed his extended version of the periodic table. On 6 March 1869, he made a formal presentation to the Russian Chemical Society, titled "The Dependence between the Properties of the Atomic Weights of the Elements", which described elements according to both atomic weight (now called "relative atomic mass") and valence. This presentation stated that
Emerald Tablet
C.G. Jung identified "The Emerald Tablet" with a table made of green stone which he encountered in the first of a set of his dreams and visions beginning at the end of 1912, and climaxing in his writing "Seven Sermons to the Dead" in 1916. Historians of science, Eric John Holmyard (1891–1959) and Julius Ruska (1867–1949) also studied the tablet in the twentieth century. Because of its longstanding popularity, the "Emerald Tablet" is the only piece of non-Greek Hermetica to attract widespread attention in the West.