98 PROCEEDINGS OP THE AMERICAN ACADEMY. 



1860. Synthesis of the Chloride. 



Dumas 59.02 



1863. Reduction of the Oxides in Hydrogen. 



Russell 58.74 



1866. Analysis of Nickel Potassic Sulphate. 



Sommaruga 58.03 



1867. By relation to Gold, out of Sodic Auro-chloride. 



Winkler 59.45 



1867. Measurement of Hydrogen evolved by acting on 

 Nickel with HCl. 



Russell 58.77 



1871. Analysis of Strychnine and Brucine Nickelo-cyanides. 



Lee 58.01 



1883. Analysis of the Sulphate. 



Baubigny 58.73 



1886. Reduction of Oxide (NiO) by Hydrogen. 



Zimmermann 58.71 



1890. Reduction of Oxide by Hydrogen. 



Mond, Langer, and Quincke 58.58 



1892. Conversion of Sulphate to Oxide, and Reduction in 

 Hydrogen. 



Schiitzenberger 58.54 



1892. Kruss and Schmidt 57-64 



1893-94. Analysis of Nickelous Chloride and by relation 

 to Iodine. 



Winkler 59.05-58.87 



Value accepted by Ostwald,* 1890 ... Ni — 58.5 

 « " Clarke,t 1896 . . . Ni = 58.687 



" " Seubert,! 1896 ... Ni = 58.9 



A glance at this list shovrs the lack of consistency in the results 

 obtained. In many cases this is sufficiently accounted for by the in- 

 adequacy of the methods, and the known impurity of the materials used, 

 without taking into consideration the unconfirmed admixture of unknown 

 impurities. A critical investigation of the data already published would 

 be an endless and perhaps unprofitable labor, and we prefer at this time 

 rather to record the method and results of our own work than to enter 

 into any discussion of claims heretofore advanced. 



* Lehrbuch, Vol. I. p. 96. 



t Recalculation of tlie Atomic Weights, loc. cit. 



X Zeitschr. Anorg. Chem., XIII. 229, 



