Blocki moved to Chicago in 1862 and joined the drug firm of Fuller , French and Fuller ; this was his first and only employer . On August 12 , 1865 , at the age of twenty , Blocki established his own retail and wholesale drug firm known as Blocki , Dietzsche & Co . The firm specialized in high quality chemicals , perfumes , essences and essential oils . The business was destroyed by the Great Chicago Fire of 1871 but quickly reopened at a new location in one of the few surviving business buildings in the city
Great Chicago Fire
Great Chicago Fire
John Blocki