MOLYBDENUM. 83 



by a current of dry air. It was tested before being analysed. 

 The extreme difierence in the results was 0.8 for O = 100. 

 All weighings in vacuo. [Erdmanri' s Journ.fur Prak. Chem., 

 31, 1844, 392.) 



E. Millon: 199.94. (0 = 16); 1249.63 (0 = 100). 



Millon made two experiments by beating mercuric chlo- 

 ride with calcic oxide in a current of hydrogen and con- 

 densing the metal. The experiments gave 73.87 and 73.82 

 per cent, mercury. If CI = 442.64, the value follows. The 

 chloride was dissolved in ether and sublimed. It was per- 

 fectly soluble in ether and alcohol, and was well crystallized. 

 [Faris Comptes Bend., W, 1845, 1291.) 



L. Svanberg: 200 (0 = 16); 1250 (0 = 100). 



Svanberg made three experiments by the same method 

 employed by Millon. The mean result was 1248.47; ex- 

 treme difference, 0.94 ; but Svanberg shows that there was 

 probably loss, and that the larger the quantity of chloride 

 employed the higher the result. He regards Erdmann and 

 Marchand's result as most probable, but in need of con- 

 firmation. CI = 443.28. {Erdmami's Journ. fur Prak. 

 Chem., 45, 1843, 468; Kongl. Vet. Akad. Handl, 1845, 135.) 



MOLYBDENUM. 



Regnault determined the specific heat of molybdenum. 

 It answers to an atomic weight of about 96. {Gmelin-Kraut, 

 I. c.) 



J. J. Berzelius: 95.36 (0 = 16); 596.1 (0 = 100). 



One hundred parts of anhydrous plumbic nitrate, dis- 

 solved and precipitated with neutral ammonium molybdate, 

 gave 110.68 parts plumbic molybdate. If Pb = 1294.645, 

 N = 87.53, the value follows. Berzelius expresses himself 

 dissatisfied with the accuracy of the determination. {Pog- 

 gend. Ann., 8, 1826, 23; and Lehrbuch, 3, 1208.) 



Svanberg and Struve: 92.13 (0 = 16); 575.829 

 (O = 100). 



After trying various methods without getting accordant 

 results, these chemists made ten experiments on the sul- 



