104 



THE ATOMIC WEIGHTS. 



same direction, and increase the apparent percentage of 

 MgO in the magnesite. On the yellow mineral from Snarnm 

 the crude results are as follows, giving percentages of MgO, 

 FeO, and CO2 after eliminating silica: 



Mean, 47-3299 =t .0037 



After applying corrections for loss and retention of 00 o, 

 as previously indicated, the mean results of the foregoing 

 series become — 



CO.,. 



51-9931 



MgO. 

 47-2743 



FeO. 

 .7860 



The ratio between the MgO and the CO,, after correcting 

 for the iron, will be considered further on. 



Of the white magnesite from Snarum but a single anal- 

 ysis was made, which, for present purposes may be ignored. 

 Concerning the Frankenstein mineral three series of anal- 

 yses were executed. In the first series the following results 

 were obtained : 



8.996 grm. CO2 -= 8.2245 gi™- MgO. 

 7.960 " 7.2775 



9.3265 " 8.529 



7-553 " 6.9095 



47.760 per cent. MgO. 



47.761 



47.767 



47.775 



Mean, 47.766, ± .0022 



This mean, corrected for loss of CO, in drying, becomes 

 47.681. I give series second with corrections applied : 



6.8195 grm- MgCOa gave 3.2500 grm. MgO. 



1 1. 3061 " 5-3849 



9-7375 " 4-635 



12.3887 " 5.9033 



32-4148 " 15-453 



38.S912 " 18.5366 



26.5223 " 12.6445 



658 per cent. 

 628 



599 



650 " 



674 " 

 663 " 



675 " 



Mean, 47.650, -±l .0069 



