William Henry Perkin Junior, English chemist, c 1916.

UNITED KINGDOM - JUNE 10: Photograph of William Henry Perkin Jr (1860-1929), signed by the sitter, probably taken in his laboratory in the then new Dyson Perrin Laboratory at Oxford, around the time it was opened in 1916. Perkin Jr was one of three sons of the famous English chemist Sir William Henry Perkin (1838-1907). Also a chemist, he is remembered for synthesising numerous organic compounds, including camphor and several alkaloids. He was Professor of Chemistry at Manchester (1892-1912) and Waynflete Professor of Chemistry at Oxford (1912-1929). From a collection of 19 photographs relating to Sir William Henry Perkin (1838-1907), his relations, and the synthetic dyestuffs industry. (Photo by SSPL/Getty Images)