BIOGRAPHICAL INDEX 561 



REY, JEAN, d. 1645 



1630. Tin and lead increase in weight on calcination, 26 



RICHARDS, J. W. Measurement of atomic weights, 318 



RICHARDS AND JACKSON. Atomic heats between 20 and 

 - 1 80, 366 



RICHARDS AND LEMEERT. Variable atomic weight of lead, 303 



RlCHTER, J. B., ., 1762, Schleswig ; d. 1807, Berlin. Stochio- 

 metrie (17921794) Ueber die neueren Gegenstande 

 der Chymie (New Chemical Topics] (1791-1802). 

 Reciprocal proportions in the neutralisation of acids, 

 310 



RONTGEN, WILHELM CONRAD. Ice-molecules and water- 

 molecules, 527 



ROUELLE, GuiLLAUME FRANCOIS, b. 1703, nr. Caen ; d. 1770, 



nr. Paris 



1744. Definition of salt ; water of crystallisation, 25 

 1754. Alkalis, earths and metals as bases, 25 



RYDBERG, J. R. Ordinals, 493 ; number of the elements, 493 ; 

 coronium and nebulium, 493 



SAGE, BALTHAZAR GEORGES (1740-1824) 

 1777. Phosphorous acid, 179 



DE SAUSSURE, HORACE BENEDICT, b. 1740, d. 1799, Geneva 



1807, 1814. Analysis of alcohol and ether, 387 



SCHEELE, KARL WILHELM, b. 1742, Stralsund ; d. 1786, 



Koping, Sweden 



1777. On Air and Fire (trans. 1780, repr. in part, A.C.R. VIII) 

 Air a mixture, 43 ; discovery of oxygen, 44 ; acids 

 and gases derived from nitre, 198 ; fused nitre con- 

 tains a weak acid, 199 ; decomposition of fulminating 

 gold, 260 ; sulphuretted hydrogen ("stinking sulphur- 

 eous air"), 171, 175 



Chemical Essays, (tr. from the Transactions of the 



Academy of Sciences, Stockholm, by T. Beddoes, 

 1786; translation repr. 1901, and in part A.C.R. XIII). 

 All quotations are taken from the modern reprints. 



(a} 1771. "On Fluor Mineral." Hydrofluoric acid, 234 



(b} 1774. "On Manganese." Discovery of chlorine, 211 ; proper- 

 ties of chlorine, 213 ; action on cinnabar, 226 ; am- 

 monia oxidised by manganese, 258 ; and by chlorine, 

 260 



(c) 1779. "On Plumbago." Fixed air by combustion of plum- 



bago, 101 



(d) 1782. "On Prussian Blue." Prussic acid, 242 



(e) 1770-86. Preparation of vegetable acids, 13 



HIST. CHEM. O O 



