Signedlabel, top center: T. W. Richards.
Inscribedlabel, center: Helianthin / Methyl Orange / S_2 OH-C_6 H_4 N_2 C_6 H_14 N(CH_3)_2
FunctionChemistry.
From Webster's 1913 unabridged: "Helianthin: (Chem.) An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; — called also methyl orange." Theodore William Richards (b. Germantown, PA Jan. 31, 1868; d. Cambridge, MA May 2, 1928), Instructor in Chemistry, 1891-1894, Assistant Professor of Chemistry, 1894-1901, Professor of Chemistry, 1901-1912, Erving Professor of Chemistry, 1912-1928 and first Director of the Gibbs Laboratory, 1913-1928. Richards received the Davy Medal of the Royal Society (1910), the Faraday Medal of the Chemical Society in (1911), and the Willard Gibbs Medal of the American Chemical Society (1912). He was also the first American to win the Nobel Prize in Chemistry (1914) for determining the atomic weights of 25 elements.
Related WorksWebster's Unabridged Dictionary, 1913 edition, s.v. "Helianthin."