“…20 From the left to right are standing: the German chemist Albert Ladenburg (1842-1911), 21 the Danish chemist and historian of chemistry Sophus Mads Jørgensen (1837-1914), 22 the Finnish chemist and historian of chemistry Evard Immanuel Hjelt (1855-1921), 23 the German chemist Hans Heinrich Landolt (1831-1910), 24 the German chemist Clemens Alexander Winkler (1838-1904), 25 who discovered germanium in 1886, and the British chemist and historian of chemistry Thomas Edward Thorpe (1845-1925). 26 To the left of Beilstein, who sat second from the left, was the Dutch chemist Jacobus Henricus van't Hoff (1852-1911), 27 a Nobel Laureate in Chemistry in 1901, and on the right -the Scottish chemist William Ramsay (1852-1916), 28 who discovered of inert gaseous elements in air (neon, argon, krypton, and xenon) and was awarded the Nobel Prize in Chemistry in 1904, the Russian chemist D. I. Mendeleev, [29][30] who discovered the Periodic Law in 1871, the German chemist Adolf von Baeyer (1835-1917), 31 who received the Nobel Prize in Chemistry in 1905, and the Italian chemist Alfonso Cossa (1833-1902). 32…”