424 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



results given below. The nickel salt contained three molecules of water, 

 and the cobalt salt two molecules : 



mc/),.3H,o. 



1.1945 grm. gave .528 grm. CO,. 44.203 per cent. 



2.5555 " 1.12625 " 44.072 



3.199 " 1.408 " 44.014 



5.020 " 2.214 " 44.104 



Mean, 44.098, ± .027 

 The following percentages of nickel were found in this salt: 



Mean, 47.7475, ± .0213 



The following were the percentages found for cobalt: 



32.552 

 32.619 

 32.528 

 32.523 



Mean, 32.5555, ± .0149 



In a later paper' Schneider also gives some results obtained witli a 

 nickel oxalate containing but two molecules of water. This gave him 

 47.605 per cent, of CO., and the following percentages of nickel : 



31.4115 

 31.4038 



Mean, 31.4076, ± .0026 



The conclusion at which Schneider arrived was that the atomic weights 

 of cobalt and nickel are not identical, being about 60 and 58, respectively. 



' Poggend. Annalen, 107, 616. 



