NITRATE CHLORIDE RATIO. 193 



This, therefore, appears to have been the purest silver 

 nitrate used by him. 



The second series was made from the material used in 

 No. 6 of the syntheses that is, which must have been 4000 

 meters deep or 200 degrees below freezing point conditions 

 which might have affected it. At any rate, it yielded high 

 values for N. 



The third series was made by dissolving a silver deposit 

 obtained by the electrolysis of silver cyanide in potassium 

 cyanide. 



The values of Marignac are above all those of Stas, and 

 less concordant the line joining all is the longest. 



This is the graphical representation of all the facts 

 observed, reduced by the Clarke atomic weights, as repeat- 

 edly explained. 



Even if looking at the results of Stas alone, can any one 

 call these atomic weights well determined, clustering around 

 some mean value ? 



But if taken at their worth, if overlooking their very 

 notable scattering from 13.84 to 13.94, that is over a full 

 tenth of a unit, will not the point heavily marked N be the 

 center (in such case of gravity, all points being equally well 

 determined count equal in weight) for all 10 determinations 

 of Stas? 



The value for that point is 13.894; but this is again 

 exactly |$ of the atomic weight of oxygen of Clarke, used 

 in these calculations. 



Accordingly, if these determinations of Stas can deter- 

 mine anything in regard to the atomic weight of nitrogen, 

 they prove that it is exactly fourteen-sixteenths of that of 

 oxygen. 



Hence if we take oxygen at 16 exactly, then determina- 

 tions of Stas give N = 14 exactly. There is no getting 

 around that. 



Of course, we have here again the same trouble about 

 the silver. 



The atomic weight of Clarke, deducted from the totality 

 of the determinations of Stas, is as before stated, 107.108; 



