72 PROCEEDINGS OP THE AMERICAN ACADEMY. 



and oxide (58.93 to 59.07) confirm this value, one may assume that it is 

 not greatly iu error. In any case, the Harvard analyses of the bromides 

 of nickel and cobalt must stand and fall together, for they were made by 

 methods essentially similar ; and they must at least give the ratio of the 

 atomic weights (58.706 : 58.995) with some approach to accuracy. Each 

 of these numbers has found quite independent support for its actual as 

 well as the relative value, so that for the present the study of these 

 atomic weights will not be pursued further in this Laboratory. 



Cambridge, June 23, 1899. 



