BIOGRAPHICAL INDEX 551 



between chlorine, iodine, and sulphur, 226, 451 ; 

 chloric acid and chlorates, 228 



1815. "On Prussic Acid." The cyanogen radical, 399; 

 hydrocyanic acid and the cyanides, 245 ; cyanogen, 

 245, and cyanogen chloride, 407 ; use of copper 

 oxide in the combustion of mercuric cyanide, 394 



1815. "On the Analysis of Alcohol and of Sulphuric Ether." 



Vapour-density of alcohol and ether, 388, 401 



1816. "On the Combinations of Azote with Oxygen." Coin- 



position of nitrogen peroxide, 195 ; nitric and nitrous 

 acids, 202 ; liquid nitrogen peroxide, 525 



GEBER. An Arab chemist, said to have been born in 

 Mesopotamia at the end of the eighth century ; or 

 to have been born in Persia, lived at Seville and died 

 there A.D. 765. Greatest of the alchemists, 2 ; pre- 

 paration of oil of vitriol, 13 ; nitric acid ("dissolving- 

 water"), 14; aqua regia, 14; lunar caustic or silver 

 nitrate, 19 ; action of acids on metals, 16 ; prepara- 

 tion of caustic alkali, 54 ; sulphur dissolved by alkalis, 

 171 



GENGEMBRE 



1783. Discovery of phosphoretted hydrogen, 180, 181 



1785. Properties of phosphorous acid, 179 

 GEOFFROY, TIENNE FRANCOIS (1672-1731) 



1718. Tables of affinity 



GERHARDT, KARL FRIEDRICH, b. 1816, Strassburg ; d. 1856, 

 Strassburg. Professor of Chemistry at Montpellier' and then at 

 Strassburg 



1839. On the copulation of residues, 417 



1843. Halvesthe formukeof organic compounds, 41 9; corrected 

 atomic weights, 437 



1853. Preparation of acetic anhydride, 432 



1855. On conjugated radicals, 430 



1856. Traite de Chimie Organique, 4 Vols., 1853-1856. Dis- 



tinguishes the hydrogen and chlorine radicals from 

 hydrogen and chlorine gas, 420 ; four inorganic 

 types, 425, 432 ; primary, secondary, and tertiary 

 amines, 423 



GLAUBER, JOHN RUDOLPH, b. 1603, Karlstadt ; d. 1668, 



Amsterdam 



1648-50. Philosophical Furnaces. Preparation of green 

 vitriol and blue vitriol, 10, 18 ; oil of vitriol, 13 ; 

 nitric acid, 14; spirit of salt, 14; aqua regia, 15 ; 

 properties of oil of vitriol, 15 ; action of oil of vitriol 

 on salt and on nitre, 21 ; preparation of muriates, 



