INDIUM. 59 



last five experiments the gas was also passed over red-hot 

 copper to remove traces of oxygen.) * {Erdmami's Journ. 

 fur Prak. Chem., 26, 1842, 461.) 



J. S. Stas: 1.0025 (0 = 16). 



From all the investigations that have been made on the 

 specific gravity of the gases, the composition of water, etc., 

 Stas is inclined to believe that the atomic weight of hydrogen 

 cannot be less than above. Stas found that 100 silver were 

 equivalent to 49.5973 ammonium chloride. [If N := 14.044, 

 and 01 = 35.457, this relation would give II = 1.0074.] 

 {Slas, Untersuch. ilber. Ghem. Prop., Leipzig, 1867.) 



J. Thomsen : 1.0025 (0 = 16). 



Thomsen made three experiments on the oxidation of a 

 known volume of h3'drogen by cupric oxide, and five ex- 

 periments on the combustion of a known volume of hydro- 

 gen in oxygen, which proved that 2 litres of hydrogen gave 

 1.6082 grammes of water under normal conditions, and at 

 latitude 45°. According to Regnault, 1 litre of oxygen and 

 2 litres of hydrogen would weigh 1.6084 grammes. Hence 

 1 volume oxygen and 2 volumes hydrogen form water ; and 

 if H = 1, O = 15.96, [or if O = 16, H = 1.0025.] {Berlin, 

 Per. der Chem. Ges., 3, 1870, 928.) 



INDIUM. 



Bunsen found the specific heat of In 0.565 and 0.574, 

 which correspond to an atomic weight of about 114. {Pog- 

 gend. AnnaL, lJf.1, 28.) 



F. Reich and T. Richter : 111.39 (0 = 16). 



In one experiment pure indium was dissolved in nitric 

 acid, the oxide precipitated with ammonia and weighed. 

 This experiment gave In = 463.4 for O = 100, and on the 

 supposition that the metal was di-atomic. In a second ex- 

 periment indium sulphide was dissolved in nitric acid, and 

 the resulting sulphuric acid precipitated with barium chlo- 

 ride. This gave In = 464.9. The number taken is the mean. 

 S = 200. The metal was prepared from the oxide. After 

 the removal of lead, etc., with hydrogen sulphide, the oxides 



