“ In 1837 he was elected professor of chemistry in the University of the City of New York, and was a professor in its school of medicine in 1840–1850, president of that school in 1850–1873, and professor of chemistry until 1881. He died at Hastings, New York, on the 4th of January 1882. He made important researches in photo-chemistry, made portrait photography possible by his improvements (1839) on Daguerre’s process, and published a Text-book on Chemistry (1846) , Text-book on Natural Philosophy (1847) , Text-book on Physiology (1866) , and Scientific Memoirs (1878) on radiant energy. ”

“ He succeeded his father as professor of chemistry, but only for a year, dying in New York on the 20th of November 1882. Henry Draper’s most important contributions to science were made in spectroscopy ”