Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
Friedrich Wohler (1800-1882) was a German chemist who first synthesized a natural product, urea. As shown on the stamp, ammonium cyanate decomposes when heated into urea. Wohler originated many analytical procedures, isolating boron and silicon, among others. A collaborator of Liebig's, he also edited Annalen der Chemie.