BIOGRAPHICAL INDEX 553 



HERMANN, HANS RUDOLPH (1805-1879) 



1830. Radicals of organic acids as oxides of hydrocarbons 

 HESS, GERMAIN HENRI (1802-1850) 



1842. Law of thermoneutrality, 505 

 HIGGINS, WILLIAM 



1 799- On Bleaching. Potash an element, 257 

 VAN T'HOFF, JACOBUS HENDRICUS (1852-1911) 



Isomerism of carbon compounds, 441 

 HOFFMANN. 



1772. Sulphuretted hydrogen, 171 



HOFMANN, AUGUST WILHELM, b. 1818, Giessen ; d. 1892, 

 Berlin. Professor of Chemistry at Berlin, and at the Royal 

 College of Chemistry, London 



1850. Three types of nitrogen-bases, 423 ; tetramethyl- 



ammonium iodide, phosphonium iodide, 433 

 HOMBERG, WILHELM, b. 1652, Batavia ; d. 1715, Paris 



1702. Preparation of boric acid or " sedative salt," 288 

 HOOKE, ROBERT, b. 1635, Freshwater; d. 1703, London. 

 Assistant to Boyle, Curator of Experiments to the Royal 

 Society, Professor of Geometry at Gresham College, London 



1665. Micrographia. Air compared with fluid saltpetre, 32 



KEKULE, FRIEDRICH AUGUST, b. 1829, Darmstadt ; d. 1896, 

 Bonn. Professor of Chemistry in the University of Bonn 

 1857. "Constitution of Mercury Fulminate." The marsh- 

 gas type, 437 



1857. "On Copulated Compounds and the Theory of Poly- 



atomic Radicals." Multiple types, 427 ; mixed 

 types, 429 ; substitution value or atomicity, 433 



1858. "Constitution and Metamorphoses of Chemical Com- 



pounds and the Chemical Nature of Carbon" 

 (Klassiker, No. 145). Carbon tetratomic, 438 ; the 

 carbon skeleton, 438 



1864. "On the Atomicity of the Elements." Fixed valency, 



441 ; molecular compounds, 441 



1865. "On the Constitution of Aromatic Substances. 



Structural formula for benzene, 440 



1869. Apparatus for combustion of organic compounds, 395 ; 

 1866-1887. Lehrbuch der Organischen Chemie, 4 Vols., 



Graphic formulae, 439 



KOPP, HERMANN, b. 1817, Hanau ; d. 1892, Heidelberg. 

 Professor of Physics and Chemistry in the University of 

 Giessen 



1843-1847. Geschichte der Chemie, 4 Vols. 



