CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF 

 HARVARD COLLEGE. 



A REVISION OF THE ATOMIC WEIGHT OF COBALT. 



FIRST PAPER. — THE ANALYSIS OF COBALTOUS BROMIDE. 



By Theodore William Richards and Gregory Paul Baxter. 



Presented June 9, 1897. 



Introduction. 



Simultaneously with the work described in the preceding paper, a 

 similar investigation of cobalt was in progress. Earlier work upon this 

 metal had led to results quite as incapable of ready interpretation as 

 those concerning nickel ; even very recent work upon the atomic weight 

 of cobalt allows a range of much over a unit (from 58.78 to 60.1) as the 

 possible field within which the truth may lie. Professor Clarke has 

 given a full summary of all the available data upon this subject in his 

 recent work * upon the Recalculation of the Atomic Weights, and for 

 references and details the reader is referred to this useful volume. A 

 chronological list is reprinted here merely to show how urgent is the 

 need for further labor. 



Earlier Work on Cobalt. 

 (0==16.) 



* Smithsonian Miscellaneous Collections, Constants of Nature, Part V. p. 29 L 



